Seiko Cal. 3864 - 763

This Spring Drive model from 1975 features a 41mm Stainless Steel case. The Bidirectional bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-9e54ac43817d]

Also known as: Sportsmatic, Crown

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

8.9mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

150m

Dial Color

Silver

Jewels

28j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1975

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