Seiko Cal. 3870 - 650

The Seiko 3870-650 represents an important milestone in Seiko's 1978 lineup. Powered by the 3870 caliber with 31j jewels beating at 28,800 bph, it delivers a 39 hours power reserve. [seikata-wm-dbb1362a48a5]

Also known as: UFO

Specifications

Movement

Solar

Case Material

Titanium

Case Width

34mm

Case Thickness

8.8mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Silver

Jewels

31j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1978

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