{"id":26457,"date":"2021-03-24T13:54:51","date_gmt":"2021-03-24T13:54:51","guid":{"rendered":"https:\/\/www.horbiter.com\/the-seiko-prospex-sla023j1-marine-master-blue-watch-hands-on\/"},"modified":"2025-09-25T21:32:46","modified_gmt":"2025-09-25T19:32:46","slug":"seiko-prospex-sla023j1-marine-master-blue-watch-hands-on","status":"publish","type":"post","link":"https:\/\/www.horbiter.com\/en\/seiko-prospex-sla023j1-marine-master-blue-watch-hands-on\/","title":{"rendered":"The Seiko Prospex SLA023J1 Marine Master Blue watch hands-on"},"content":{"rendered":"<p style=\"text-align: justify;\">It is a common belief that any professional diving watch designed for saturation diving should have a helium escape valve.<\/p>\n<p style=\"text-align: justify;\">Also, the story goes that a single-piece steel case appeared just during the 70s, to be after that abandoned by all watch manufacturers.<\/p>\n<p style=\"text-align: justify;\">Finally, and this is the most bizarre if not old-fashioned, it is widely accepted that a Japanese diving watch is a perfect companion during the toughest diving session, but too professional looking and hard-to-wear as an everyday timepiece.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"width: 100%;\" title=\"seiko-prospex-sla023j1-sette\" src=\"\/media\/CACHE\/images\/uploads\/seiko-prospex-sla023j1-sette.c822ce605d66.jpg\" alt=\"seiko-prospex-sla023j1-sette\">The <strong>Seiko Marine Master<\/strong>, and the <strong>2019<\/strong> edition especially, is proof positive that the above sentences are just general belief: widely considered as a pillar of the <strong>Seiko Prospex<\/strong> collection ever since, it is the biggest brother to watches like the <a href=\"https:\/\/www.horbiter.com\/en\/seiko-prospex-dawn-grey-series-srpd01k1-srpd03k1-limited-edition-watches\/\" target=\"_self\" rel=\"noopener\"><strong>Seiko Prospex Dawn Gray<\/strong> <\/a>and the <a href=\"https:\/\/www.horbiter.com\/en\/seiko-prospex-spb053j1-watch-hands-on-horbiter\/\" target=\"_self\" rel=\"noopener\"><strong>Seiko Prospex SPB053J1<\/strong><\/a>, following the likes of its noblest <strong>Grand Seiko<\/strong> siblings (and the <strong>Hi<\/strong>\u2013<strong>Beat<\/strong> <strong>Prospex<\/strong> too).<\/p>\n<p style=\"text-align: justify;\">It is no doubt one of the most respected <strong>Seiko<\/strong> professional diving watches so far, and one of those that any <strong>PADI<\/strong> certified diver would unquestionably wear as a mechanical back-up device to the best digital equipment available.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"width: 100%;\" title=\"seiko-prospex-sla023j1-sei\" src=\"\/media\/CACHE\/images\/uploads\/seiko-prospex-sla023j1-sei.929caf2dacd0.jpg\" alt=\"seiko-prospex-sla023j1-sei\">From a technical standpoint, it gives the term \u201c<em>water and helium tightness<\/em>\u201d a whole new meaning: its sturdy case was conceived as a single piece of steel, such a rare choice given that its peers are often more luxury watches also designed to feature deep diving capabilities, rather than being rugged tool watches.<\/p>\n<p style=\"text-align: justify;\">The latest iteration of this watch, the <strong>2019 Seiko<\/strong> \u201c<em>Marine Master<\/em>\u201d <strong>SLA023J1 Blue<\/strong>, has grown in style and details to become more refined than ever before.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"width: 100%;\" title=\"seiko-prospex-sla023j1-uno\" src=\"\/media\/CACHE\/images\/uploads\/seiko-prospex-sla023j1-uno.46a6847044f6.jpg\" alt=\"seiko-prospex-sla023j1-uno\">At first glance, it is clear that <strong>Seiko<\/strong>\u2018s product managers aimed at refining a big, bold looking product, making it more modern, and on par with its competitors (from a touch-and-feel point of view).<\/p>\n<p style=\"text-align: justify;\">It is now geared towards a broader audience: the grooved rotating bezel showcases a ceramic inlay (it first appeared on the black<strong> Seiko SLA021J1<\/strong>), an option that <strong>Seiko<\/strong> has adopted later than anyone else in the industry, along with a thick sapphire crystal (sporting an anti-glare treatment on the inside, only) that has replaced the <strong>Seiko<\/strong>-patented <strong>Hardlex<\/strong> glass.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"width: 100%;\" title=\"seiko-prospex-sla023j1\" src=\"\/media\/CACHE\/images\/uploads\/seiko-prospex-sla023j1.c54eab8834f3.jpg\" alt=\"seiko-prospex-sla023j1\">A <strong>Hardlex<\/strong>-made glass guarantees low replacement costs (thus positively affecting the retail price too), but is obsolete when taking into account the new <strong>Marine Master<\/strong> positioning.<\/p>\n<p style=\"text-align: justify;\">The <strong>Seiko Marine Master<\/strong> \u201c2.0\u201d first appeared in <strong>2018<\/strong> as a <strong>Limited Edition<\/strong> in <strong>Green<\/strong>, that sold like hotcakes without ever hitting the stores around the world in most cases (they almost all sold during <span style=\"color: null;\"><strong>Baselworld<\/strong><\/span>), and this blue variation is expected to replicate that success, without being limited in time and quantities.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"width: 100%;\" title=\"seiko-prospex-sla023j1-quattro\" src=\"\/media\/CACHE\/images\/uploads\/seiko-prospex-sla023j1-quattro.0013557ab36a.jpg\" alt=\"seiko-prospex-sla023j1-quattro\">Regarding the blue: it is matte blue, on the bezel, mated to a bright palette, on the dial. My feeling is that the brand\u2019s marketing gurus wanted to mitigate that rough-looking attitude, that is a <strong>Marine Master<\/strong>\u2018s hallmark, when making the <strong>SLA023J1<\/strong>, to turn the formula into something more stylish and premium instead.<\/p>\n<p style=\"text-align: justify;\">Nonetheless, it is quite an impressive watch: at <strong>44<\/strong>,<strong>3mm<\/strong> across, it sports an outrageous <strong>15<\/strong>,<strong>4mm<\/strong> thickness. It is something you have to familiarize with and accept when buying a <strong>300m<\/strong> waterproof timepiece sealed to such an extent that no particle of helium would be ever allowed to enter the case.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"width: 100%;\" title=\"seiko-prospex-sla023j1-tre\" src=\"\/media\/CACHE\/images\/uploads\/seiko-prospex-sla023j1-tre.dfc4c383f334.jpg\" alt=\"seiko-prospex-sla023j1-tre\">It shares the same one-piece architecture with a <strong>Seiko Prospex 1968 Automatic Diver\u2019s Re-creation Limited Edition SLA025<\/strong>, for example, but is older from an engineering perspective, and that proves why the <strong>Marine Master<\/strong> is thicker than its vintage-inspired counterpart.<\/p>\n<p style=\"text-align: justify;\">However, its bold design has made it successful, and its thickness is, therefore, part of the game. If you look around for a Swiss counterpart, the only luxury brand that has ever crafted a one-piece diving watch was <strong>Omega Watches<\/strong>. Its proposal was the iconic <strong>Ploprof<\/strong> and broke cover during the seventies.<\/p>\n<p style=\"text-align: justify;\">No big manufacturer other than <strong>Seiko<\/strong> adopts today this architecture, that is expensive to craft and hard to service too, since the only way for a technician to access the <strong>8L35<\/strong> mechanical caliber (a <strong>50<\/strong>\u2013<strong>hour<\/strong> maximum power reserve movement with hand-wound capability) is to remove glass, hands, and dial, first, respectively.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"width: 100%;\" title=\"seiko-prospex-sla023j1-cinque\" src=\"\/media\/CACHE\/images\/uploads\/seiko-prospex-sla023j1-cinque.3903fdc132fd.jpg\" alt=\"seiko-prospex-sla023j1-cinque\">If we take a look at the dial, from up-close, some details make a <strong>Seiko Prospex SLA023J1<\/strong> stand out, and are the gold accents chosen for logos, central second hand, and markers.<\/p>\n<p style=\"text-align: justify;\">The gold color is a recurring theme in the Japanese tradition and is usually associated with the most prestigious Japanese watches, not just those sporting the <strong>Seiko<\/strong> brand logo.<\/p>\n<p style=\"text-align: justify;\">Also, according to Japanese culture, colors have a strong meaning, as I learned when I discovered the meaning behind the so-called \u201c<em>Twelve Levels<\/em>\u201d table.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"width: 100%;\" title=\"seiko-prospex-sla023j1-due\" src=\"\/media\/CACHE\/images\/uploads\/seiko-prospex-sla023j1-due.e7f209537c48.jpg\" alt=\"seiko-prospex-sla023j1-due\">As we move down to the bracelet, it is solid and well done, but I\u2019m not too fond of the folding clasp or, else said, I would have gone for a new one that sported not the same technical solution as a <strong><a href=\"https:\/\/www.horbiter.com\/en\/seiko-prospex-padi-special-edition-srpa21k1\/\" target=\"_self\" rel=\"noopener\">Turtle PADI<\/a><\/strong> whose retail price is nearly six times lower.<\/p>\n<p style=\"text-align: justify;\">The <strong>Seiko SLA023J1<\/strong> or <strong>Seiko Marine Master Blue 2019<\/strong>, if you like, was long-awaited by the <strong>Seiko<\/strong> fans, as soon as the first photos appeared on the Internet, and I have to admit that the final product is worth that wait.<\/p>\n<p style=\"text-align: justify;\">It perfectly fills the gap between the <strong>Hi<\/strong>\u2013<strong>Beat<\/strong> diving watch collection and the entry-mid range products.<\/p>\n<p style=\"text-align: justify;\">The price has consistently grown in comparison to the outgoing model, but so have details and specifications, with a few exceptions being the folding clasp that looks too cheap to me.<\/p>\n<p style=\"text-align: justify;\">With that said, no other professional diving match can ever match the unbeatable combination of price, performance, build quality, and signature <strong>Marine Master <\/strong>style of the <strong>SLA023J1<\/strong>.<\/p>\n<div style=\"min-height: 10px; height: auto; width: auto; margin: 0 auto; position: relative; display: table;\"><\/div>\n<p>(Photo credit: Horbiter\u00ae)<\/p>\n<p style=\"text-align: right;\">Gaetano C @Horbiter\u00ae<\/p>\n","protected":false},"excerpt":{"rendered":"<p>It is a common belief that any professional diving watch designed for saturation diving should have a helium escape valve. Also, the story goes that a single-piece steel case appeared just during the 70s, to be after that abandoned by all watch manufacturers. Finally, and this is the most bizarre if not old-fashioned, it is [&#8230;]<\/p>\n<p><a class=\"btn btn-secondary understrap-read-more-link\" href=\"https:\/\/www.horbiter.com\/en\/seiko-prospex-sla023j1-marine-master-blue-watch-hands-on\/\">Read More&#8230;<span class=\"screen-reader-text\"> from The Seiko Prospex SLA023J1 Marine Master Blue watch hands-on<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":13033,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[544,549],"tags":[],"class_list":["post-26457","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-diving-watches","category-seiko"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.1.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>The Seiko Prospex SLA023J1 Marine Master Blue watch hands-on<\/title>\n<meta name=\"description\" content=\"Discover the Seiko Prospex SLA023J1 Marine Master Blue in our detailed review with original photos, technical features, and pricing.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.horbiter.com\/en\/seiko-prospex-sla023j1-marine-master-blue-watch-hands-on\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Seiko Prospex SLA021J1 Marine Master\" \/>\n<meta property=\"og:description\" content=\"Discover the Seiko Prospex SLA023J1 Marine Master Blue in our detailed review with original photos, technical features, and pricing.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.horbiter.com\/en\/seiko-prospex-sla023j1-marine-master-blue-watch-hands-on\/\" \/>\n<meta property=\"og:site_name\" content=\"Horbiter \u00e8 il magazine italiano sugli orologi di lusso. 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