Seiko Cal. 3891 - 478

Seiko 3891-478

This Spring Drive model from 1972 features a 39mm Hardlex-Coated Steel case. Powered by the 3891 caliber with 25j jewels beating at 28,800 bph, it delivers a 56 hours power reserve. [seikata-wm-0a8a71bb629a]

Also known as: Baby Tuna

Specifications

Movement
Spring Drive
Case Material
Hardlex-Coated Steel
Case Width
39mm
Case Thickness
13.0mm
Lug Width
19mm
Crystal
Sapphire
Bezel
Inner Rotating
Water Resistance
180m
Dial Color
Navy
Jewels
25j
Frequency
28,800 bph
Power Reserve
56 hours
Year
1972

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