Seiko Cal. 3857 - 770

The Seiko 3857-770 represents an important milestone in Seiko's 1978 lineup. Powered by the 3857 caliber with 24j jewels beating at 36,000 bph, it delivers a 43 hours power reserve. [seikata-wm-e84ae90883ec]

Also known as: Tuna, Flighty

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

42mm

Case Thickness

15.5mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

200m

Dial Color

Burgundy

Jewels

24j

Frequency

36,000 bph

Power Reserve

43 hours

Year

1978

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