{"product_id":"case-735-omega-seamaster-planet-ocean-600m-43-5mm-ref-215-30-44-21-03-001","title":"Case #735 — Omega Seamaster Planet Ocean 600M 43.5mm Ref. 215.30.44.21.03.001","description":"\u003ch2\u003eCase #735 — Omega Seamaster Planet Ocean 600M 43.5 mm \"Blue Ceramic\"\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eRef.\u003c\/strong\u003e 215.30.44.21.03.001\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStatus:\u003c\/strong\u003e Available\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e Excellent Pre-Owned\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eScope:\u003c\/strong\u003e Box, Papers, and Cards\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eYear:\u003c\/strong\u003e 2019\u003c\/p\u003e\n\u003ch3\u003e🔎 Case Notes\u003c\/h3\u003e\n\u003cp\u003eBlue on blue, done properly. The appeal of this reference begins with a material decision most buyers never notice from a photograph: the dial is not painted metal but blue ceramic, with Arabic numerals and a date window at 3 o'clock, sitting beneath a blue ceramic unidirectional bezel whose diving scale is rendered in OMEGA Liquidmetal™, all mounted in a 43.5 mm stainless steel case. In daylight the dial reads deep and glassy; the bezel scale, fused rather than printed, holds its crispness in a way lacquer and paint do not.\u003c\/p\u003e\n\u003cp\u003eUnderneath is the full modern Omega argument. The Master Chronometer calibre 8900 is visible through the caseback and has passed the eight tests set by METAS, the Swiss Federal Institute of Metrology, and the movement is unaffected by magnetic fields greater than 1.5 tesla (15,000 gauss). The watch is water resistant to 600 metres \/ 2000 feet \/ 60 bar and carries a helium-escape valve — specification written for saturation diving rather than marketing copy.\u003c\/p\u003e\n\u003cp\u003eThis example is dated 2019 and is graded Excellent Pre-Owned. No specific flaws were recorded during BST's physical inspection. It arrives on its Omega stainless steel bracelet, currently sized to fit an approximately 8-inch wrist, and is accompanied by Box, Papers, and Cards.\u003c\/p\u003e\n\u003ch3\u003e🕰️ The Evidence\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReference:\u003c\/strong\u003e 215.30.44.21.03.001\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel \/ Collection:\u003c\/strong\u003e Seamaster Planet Ocean 600M Co-Axial Master Chronometer 43.5 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eYear:\u003c\/strong\u003e 2019\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCase:\u003c\/strong\u003e Stainless steel, brushed and polished\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCase Diameter:\u003c\/strong\u003e 43.5 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness:\u003c\/strong\u003e 16.1 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLug-to-Lug:\u003c\/strong\u003e 49.0 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLug Width:\u003c\/strong\u003e 21 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDial:\u003c\/strong\u003e Blue ceramic, Arabic numerals, date window at 3 o'clock\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrystal:\u003c\/strong\u003e Domed scratch-resistant sapphire with anti-reflective treatment on both sides\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBezel:\u003c\/strong\u003e Blue ceramic, unidirectional, with OMEGA Liquidmetal™ diving scale\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrown:\u003c\/strong\u003e Screw-in, self-locking, screwed into the case tube\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaseback:\u003c\/strong\u003e Alveol screw-in caseback; transparent, displaying the calibre 8900\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMovement:\u003c\/strong\u003e Omega Calibre 8900, self-winding with Co-Axial escapement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMovement Type:\u003c\/strong\u003e Free-sprung balance with silicon balance spring, two barrels mounted in series, automatic winding in both directions\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertification:\u003c\/strong\u003e Master Chronometer, approved by METAS, resistant to magnetic fields reaching 15,000 gauss\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Reserve:\u003c\/strong\u003e 60 hours\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunctions:\u003c\/strong\u003e Hours, minutes, seconds, date, time zone function, helium-escape valve\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater Resistance:\u003c\/strong\u003e 600 metres \/ 2000 feet \/ 60 bar\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBracelet:\u003c\/strong\u003e Omega stainless steel bracelet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClasp:\u003c\/strong\u003e Patented extendable foldover clasp (deployant\/folding)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBracelet Fit:\u003c\/strong\u003e Approximately 8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Excellent Pre-Owned\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded:\u003c\/strong\u003e Box, Papers, and Cards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e🌟 Collector Provenance\u003c\/h3\u003e\n\u003cp\u003eOmega launched the Planet Ocean line in 2005, drawing on the brand's mid-century professional diving history but aiming at a different brief than the Seamaster Diver 300M: greater depth rating, heavier case architecture, and a visual language built around oversized Arabic numerals and a broad, legible bezel. Within the wider Seamaster family it has always been the serious-tool option rather than the dress-adjacent one.\u003c\/p\u003e\n\u003cp\u003eThe 43.5 mm case has particular standing in that story, since the earliest Planet Ocean iterations measured 43.5 mm in diameter. The size is therefore not an inflation of the original idea but a continuation of it — the proportion collectors most associate with the line. The fundamentals are all present in the modern 43.5 mm case: the typically Seamaster twisted \"lyre\" lugs, a combination of brushed surfaces and polished bevels on the sides, screw-down crown, helium escape valve and external rotating bezel.\u003c\/p\u003e\n\u003cp\u003eWhat separates this generation from earlier Planet Oceans is the material and metrological upgrade. Where older references used aluminium or painted inserts and COSC-only movements, this one pairs a ceramic dial with a ceramic bezel and Liquidmetal™ scale, and a METAS-certified calibre. This Planet Ocean style was introduced in 2017, placing a 2019 example squarely in the established run of the design rather than at an early transitional stage.\u003c\/p\u003e\n\u003cp\u003eBlue-on-blue sits alongside the black and the white\/orange configurations as one of the core steel options, and it is the one that most clearly shows off the ceramic dial — the surface has a depth under light that the black version conceals.\u003c\/p\u003e\n\u003ch3\u003e🌟 Technical Provenance\u003c\/h3\u003e\n\u003cp\u003eThe calibre 8900 is the reason this reference is a different proposition from a pre-2017 Planet Ocean. It beats at 25,200 vph, contains 39 jewels, and delivers an approximate 60-hour power reserve courtesy of its twin barrels mounted in series. METAS Master Chronometer certification goes beyond the movement's COSC chronometer status: the finished watch passes tests that replicate real-life wearing conditions.\u003c\/p\u003e\n\u003cp\u003eAntimagnetism is the headline achievement. The Si14 silicon balance spring improves resistance to shock and magnetism, and the architecture allows the movement to shrug off fields that would stop a conventional hairspring outright. For an owner, that means laptops, tablet covers, speakers and MRI-adjacent environments cease to be a background anxiety.\u003c\/p\u003e\n\u003cp\u003eTwo practical details are easy to overlook. The 8900 carries a time zone function — the hour hand is independently adjustable in one-hour steps without disturbing the running seconds — which makes this a genuinely competent travel watch despite having no GMT hand. And the movement is given a luxury finish, with rhodium-plated rotor and bridges decorated with Geneva waves in arabesque, which is the point of the display caseback on a 600-metre diver.\u003c\/p\u003e\n\u003ch3\u003e🧾 From the Case File\u003c\/h3\u003e\n\u003cp\u003eSizing first, because 43.5 mm invites assumptions. Lug-to-lug is 49.0 mm and thickness 16.1 mm, so this is unambiguously a substantial watch — it wears its depth rating honestly. On the roughly 8-inch wrist this example is currently sized for, the footprint is well-proportioned; on smaller wrists the lug span is the measurement to check, not the diameter. Lug width is 21 mm, an Omega-typical dimension worth knowing before shopping for aftermarket straps.\u003c\/p\u003e\n\u003cp\u003eDay to day, the ceramic dial and bezel are the components that will still look right in a decade. Ceramic does not fade, and the Liquidmetal™ scale is bonded rather than printed, so the bezel markings resist the dulling that eventually affects older inserts. The extendable foldover clasp allows on-the-fly adjustment as the wrist swells in heat or over a suit cuff.\u003c\/p\u003e\n\u003cp\u003eThe case for this example specifically: a 2019 watch in Excellent Pre-Owned condition with Box, Papers, and Cards, in the blue configuration that best demonstrates what the ceramic dial actually does. Note that Omega's five-year factory warranty period associated with a 2019 watch will, by date, have concluded — the accompanying cards are documentation of origin and configuration, not of current coverage. No service history has been supplied to BST, and no timing or amplitude testing figures are claimed here.\u003c\/p\u003e\n\u003ch3\u003e🗝️ BST Verdict\u003c\/h3\u003e\n\u003cp\u003eA full-specification professional diver in the configuration that shows the modern Planet Ocean at its most expressive: ceramic dial, ceramic-and-Liquidmetal™ bezel, 600 metres, and a METAS-certified calibre 8900 with a 60-hour reserve and genuine antimagnetic credentials.\u003c\/p\u003e\n\u003cp\u003eDated 2019, graded Excellent Pre-Owned with no flaws recorded at inspection, complete with Box, Papers, and Cards, and sized to an approximately 8-inch wrist. For a buyer who wants the 43.5 mm Planet Ocean — the original proportion of the line — this is a straightforward, well-documented route to it.\u003c\/p\u003e\n\u003cp\u003e👉 Every case deserves a closer look.\u003c\/p\u003e","brand":"Baker Street Timepieces","offers":[{"title":"Default Title","offer_id":58775431414063,"sku":null,"price":4500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0948\/5359\/5439\/files\/BST_7400.jpg?v=1793759001","url":"https:\/\/bakerstreettimepieces.com\/products\/case-735-omega-seamaster-planet-ocean-600m-43-5mm-ref-215-30-44-21-03-001","provider":"Baker Street Timepieces","version":"1.0","type":"link"}