Seiko Cal. 3878 - 163

Seiko 3878-163

This Spring Drive model from 1981 features a 40mm Hardlex-Coated Steel case. With its 22mm lug width and 11.8mm profile, it sits comfortably on most wrists. [seikata-wm-07b1543f9c6d]

Also known as: Bellmatic, World Timer

Specifications

Movement
Spring Drive
Case Material
Hardlex-Coated Steel
Case Width
40mm
Case Thickness
11.8mm
Lug Width
22mm
Crystal
Sapphire
Bezel
Rotating
Water Resistance
140m
Dial Color
Blue Sunburst
Jewels
30j
Frequency
21,600 bph
Power Reserve
60 hours
Year
1981

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