Seiko Cal. 3865 - 631

The Seiko 3865-631 represents an important milestone in Seiko's 1973 lineup. Powered by the 3865 caliber with 19j jewels beating at 36,000 bph, it delivers a 41 hours power reserve. [seikata-wm-3de08dcf04ea]

Also known as: Pogue, Crown

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

40mm

Case Thickness

13.9mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

160m

Dial Color

Blue Sunburst

Jewels

19j

Frequency

36,000 bph

Power Reserve

41 hours

Year

1973

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