Seiko Cal. 3817 - 903

The Seiko 3817-903 represents an important milestone in Seiko's 1978 lineup. It features a Black dial protected by a Mineral crystal and offers 50m of water resistance. [seikata-wm-84c462f70b7e]

Also known as: Monster, Rally

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

34mm

Case Thickness

12.8mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Black

Jewels

28j

Frequency

36,000 bph

Power Reserve

69 hours

Year

1978

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