Seiko Cal. 3857 - 612

Seiko 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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