Seiko Cal. 3857 - 612

The Seiko 3857-612 represents an important milestone in Seiko's 1971 lineup. Powered by the 3857 caliber with 24j jewels beating at 28,800 bph, it delivers a 41 hours power reserve. [seikata-wm-1bdaa1350fef]

Also known as: Sportsmatic, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

35mm

Case Thickness

12.8mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

50m

Dial Color

Burgundy

Jewels

24j

Frequency

28,800 bph

Power Reserve

41 hours

Year

1971

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