The Seiko Marine Master Pro. Diver Ref. SLA021 / SBDX023 is the successor of the highly acclaimed MM300 SBDX017 which was discontinued last year but not without some much needed upgrades to keep it current. Overall, the new MM300 still retains the massive mono block case at 44.3mm with a height of 15.4mm. It retains the familiar refined angular lugs that is polished and satin brushed throughout. The finishing is done using Seiko's traditional Zaratsu polishing method that is seen mainly on the Grand Seiko line, which creates a distortion-free mirror finish. The 300m water resistant case is treated with Seiko’s DiaShield coating on the case and bracelet. This provides scratch-protection and extra corrosion resistance. The SBDX023 features a high grade Seiko 26-jewel automatic, caliber 8L35, which is an undecorated and unadjusted version of the Grand Seiko movement, caliber 9S55. The 8L35 beats at 28,800 bph and has handwinding and hacking features. The movement has a 50 hours of power reserve with an expected accuracy tolerance of -10/+15 seconds per day.
The color theme of the new MM300 is black. The whole dial and bezel are finished off in a deep black color tone. Unlike the predecessor, the SBDX023 seem to have a deeper black, mainly contributed by the new material used.
The SBDX023 has kept the aesthetic of its dial, markers and handset found on the 6159. Paying close attention, we can see the SBDX023 has a gold tone seconds hand and “300m” label at 6 o’clock.
Maker
Seiko Japan
Movement
Caliber 8L35. Seiko 26-Jewel Automatic.
Accuracy range
+15/-10 sec per day
Dial
Matte black with applied luminous indexes
Luminous
Lumibrite
Case
Stainless steel
Crown type
Screwdown
Lug width
20mm
Crystal material
Sapphire crystal with anti-reflective coating on inner surface
Strap
Stainless steel bracelet, + strapcode bracelet extra + unused rubber oem strap.
Water resistance
300m
Dimensions
44.3mm in diameter, 50.5mm lug to lug, 15.4mm
Lost the papers documents but all the accessories are in tact.
With a fantastic cosmetic and mechanical condition.
Priced to fly $2700 preffered f2f in GTA etransfer or cash, but can also ship across Canada for extra at buyers cost.
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