You can buy a Seiko Marinemaster 300 with reference number SBDX001 in mint condition for about 2,700 euros. The high quality satin-brushed and polished surfaces is on par with Swiss luxury watches. Both models bear the tsunami logo on their case backs, as is typical of Seiko diving watches, and have excellent finishing.
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The advantage of the Monobloc case is that helium molecules cannot infiltrate the watch, making it suitable for professional saturation diving. The Japanese manufacturer uses its in-house Hardlex crystal in both models, which is more robust than conventional mineral glass, but not as hard as sapphire glass. This means that the inner mechanics of the watch can only be accessed if one removes the bezel, watch glass, and the dial and hands. The Sumo has a conventional screw-down case back, whereas the Marinemaster 300 has a Monobloc case, which can only be opened from the front. If you examine the cases closely, you'll notice that the backs of these watches are not the same. The design of the numerals and minute markers on the unidirectional bezels of these watches also differs. The caliber 6R15 ticks in the Sumo, whereas the Marinemaster 300 is powered by the higher-quality and more precise 8元5. The Sumo is also water resistant to 300 m (30 bar), but the two watches differ in their details. In terms of appearance, this watch is reminiscent of the popular Seiko Sumo largely due to its 44-mm stainless steel case, diving bezel, and crown at 4 o'clock. The Seiko Marinemaster 300 serves as a good entry point into the Marinemaster series. These two limited editions were introduced in 2015 in commemoration of the 50th anniversary of Seiko diving watches. At the time of its release, the SBEX001 cost 6,400 euros. In contrast, the balance wheel of the caliber 8元5, which ticks in many other Marinemasters, vibrates at the more common frequency of 28,800 A/h. What sets this titanium watch apart is the in-house movement 8L55 with its balance wheel that vibrates at a frequency of 36,000 alterations an hour (A/h). If you hope to find one of these watches in good condition, you should set aside about 3,500 euros.Įven harder to come by is the Marinemaster Professional 1000m Diver’s Hi-Beat Limited Edition, which was limited to 700 pieces and has the reference number SBEX001. The Prospex Marinemaster 300m with the reference number SBDX012 is one such model and was limited to a run of 1,000 pieces. For Seiko collectors and enthusiasts, the limited special editions are of particular interest. Prices for a mint condition Seiko Marinemaster range from about 1,000 euros for a quartz model to around 4,200 euros for a Marinemaster Professional 600m Spring Dive with a new, high-precision escapement system.
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