Seiko Cal. 3870 - 763

Released in 1975, the Cal. 3870 with design code 763 was part of Seiko's domestic market collection. Powered by the 3870 caliber with 22j jewels beating at 36,000 bph, it delivers a 36 hours power reserve. [seikata-wm-e32505f14a70]

Also known as: UFO, Rally

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

40mm

Case Thickness

14.5mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

100m

Dial Color

Green

Jewels

22j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1975

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