Seiko Cal. 6641 - 563

Seiko 6641-563

This Automatic model from 1991 features a 37mm Hardlex-Coated Steel case. With its 18mm lug width and 15.9mm profile, it sits comfortably on most wrists. [seikata-wm-a4bb5f55b88d]

Also known as: Helmet

Specifications

Movement
Automatic
Case Material
Hardlex-Coated Steel
Case Width
37mm
Case Thickness
15.9mm
Lug Width
18mm
Crystal
Mineral
Bezel
Coin-Edge
Water Resistance
170m
Dial Color
Green
Jewels
24j
Frequency
21,600 bph
Power Reserve
64 hours
Year
1991

Related Models

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