Seiko Cal. 3865 - 633

The Seiko 3865-633 represents an important milestone in Seiko's 1971 lineup. Powered by the 3865 caliber with 32j jewels beating at 36,000 bph, it delivers a 51 hours power reserve. [seikata-wm-a7aa450fcf36]

Also known as: World Timer

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

37mm

Case Thickness

12.7mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

150m

Dial Color

Green

Jewels

32j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1971

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