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Marine Master Professional 300M Ref. SBDX017

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The Seiko Marine Master Professional 300M Ref. SBDX017 is probably one of Seiko's most iconic professional diving watch.

Marine Master Professional 300M Ref. SBDX017

The SBDX017 features a high grade Seiko 26-jewel automatic (8L35) movement 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 within -10/+15 seconds per day.

Well made and finished case. Polished sides satin brushed top.

The 44mm monoblock case is made from stainless steel. With high polished sides and fine satin brushed on top, the watch exudes class. The 300m water resistant case is treated with Seiko’s DiaShield coating on the case and bracelet. This provide scratch-protection and extra corrosion resistance. While it does not make the watch scratch resistant like Dievas and Damasko, it does reduce scratches and scuffs significantly.

Seiko's Lumibrite

The dial's makers and hands are treated with Seiko's Lumibrite for awesome low light visibility. Dual-curved Hardlex with non-reflective upper coating for good visibility.

On-the-go fine adjustment on bracelet

The MM300 comes with a stainless steel bracelet and an additional rubber strap made for the MM300. The satin brushed bracelet with polished details has a ratcheting micro-adjustment for adjustments on-the-go.

Maker: Seiko Japan

Movement: Caliber 8L35. Seiko 26-Jewel Automatic.

Accuracy: -10/+15 seconds per day.

Dial: Matte black with applied luminous indexes

Luminous: Lumibrite

Date: 3 O'clock

Case: Stainless Steel.

Crown: Screwdown. Signed Crown

Lug: 20mm

Crystal: Dual curved hardlex with inside anti-reflective coating

Strap: Stainless steel bracelet. Additional rubber strap.

Water resistance: 300m. ISO certified.

Dimensions: 44mm in diameter, 49mm lug to lug, 14mm thick

Power Reserve: ~50 hours

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