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The Seiko Marine Master Professional 600M Ref. SBDB011 is probably one of Seiko's most iconic professional diving watch after the MM300 SBDX017.
|Marine Master Professional 600M Ref. SBDB011|
The Marine Master Professional 600M Ref. SBDB011 is powered by Seiko's iconoic Springdrive movement, 5R66. The 30 jewels Springdrive dualtime(GMT) movement features a power reserve of 72 hours(3 days), has a power reserve indicator and is used primarily in the Grand Seiko collection. It is also the only model from Marine Master collection that has a GMT function.
The Springdrive is a conventional automatic movement with a few key components replaced. Namely, the functional time keeping parts are gone, which are basically the pallet fork, escape wheel, balance wheel and hairspring. Replacing them is a tri-synchro regulator which is a new way of extremely precisely controlling the amount of power coming out of the mainspring. The tri-synchro regulator converts kinetic energy from the mainspring into electrical energy, which powers a quartz crystal and an electromagnetic brake which slows the movement down in accordance with information from the quartz crystal.
The result is it has the beauty of a mechanical movement, the accuracy of a quartz movement, and the smoothest seconds hand in the world.
|Springdrive movement, 5R66, with GMT & Power Reserve Indicator|
The 46mm case is made from titanium with super-hard coating. With high polished sides and fine satin brushed on top, the watch exudes class. The 600m water resistant case is treated with Seiko’s DiaShield coating on the case and bracelet. This provide scratch-protection and extra corrosion resistance. Different from the other Marine Master is the MM600's Sapphire crystal with anti-reflective treatment.
|Multiple finishing on the titanium case. Masterpiece in the making.|
The case is a masterpiece in the making. The titanium case is finished in multiple finishing, polished on the side with fine satin brushed details and fine satin brushed on the top of the lugs with polished bevel. Titanium by nature is a dull material and it takes a special technique and experience to finish it to a mirror finshing. When was the last time you see a titanium case finished to this high standard? The use of titanium means this watch is extremely comfortable due to its weight or lack of.
The dial's makers and hands are treated with Seiko's Lumibrite for awesome low light visibility.
|Titanium bracelet with DiaShield protection|
The MM600 comes with a titanium bracelet with DiaShield protection. The satin brushed bracelet with polished details has a ratcheting micro-adjustment for adjustments on-the-go.
The Seiko Marine Master Professional 600M Ref. SBDB011 is probably not for the faint hearted. It is bold and packed with arguably Seiko's most accurate movement. The watch with its titanium case is quite something you have to see and feel in person to understand the amount of work Seiko's watchmakers have put into it. The MM600 is also feature packed with a GMT function, date, power reserve counter and DiaShield. If you are in the market for Seiko's finest Marine Master and be done with, this is the watch to go for.