Seiko Cal. 3891 - 642

Seiko 3891-642

The 3891-642 is a sought-after Automatic piece from Seiko's golden era. Powered by the 3891 caliber with 25j jewels beating at 28,800 bph, it delivers a 67 hours power reserve. [seikata-wm-807ada89cfdb]

Also known as: Baby Tuna

Specifications

Movement
Automatic
Case Material
Hardlex-Coated Steel
Case Width
43mm
Case Thickness
15.7mm
Lug Width
21mm
Crystal
Hardlex
Bezel
Coin-Edge
Water Resistance
110m
Dial Color
Green
Jewels
25j
Frequency
28,800 bph
Power Reserve
67 hours
Year
1989

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