Seiko Cal. 3840 - 451

Seiko 3840-451

This Spring Drive model from 1977 features a 40mm Hardlex-Coated Steel case. With its 22mm lug width and 10.2mm profile, it sits comfortably on most wrists. [seikata-wm-3b2b372f49a3]

Also known as: Tuna, UFO

Specifications

Movement
Spring Drive
Case Material
Hardlex-Coated Steel
Case Width
40mm
Case Thickness
10.2mm
Lug Width
22mm
Crystal
Hardlex
Bezel
Inner Rotating
Water Resistance
160m
Dial Color
Navy
Jewels
26j
Frequency
21,600 bph
Power Reserve
59 hours
Year
1977

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