Seiko Cal. 6637 - 851

Seiko 6637-851

The 6637-851 is a sought-after Kinetic piece from Seiko's golden era. It features a Black dial protected by a Mineral crystal and offers 70m of water resistance. [seikata-wm-d9b560f72e70]

Also known as: Sportsmatic

Specifications

Movement
Kinetic
Case Material
Hardlex-Coated Steel
Case Width
44mm
Case Thickness
11.6mm
Lug Width
20mm
Crystal
Mineral
Bezel
Bidirectional
Water Resistance
70m
Dial Color
Black
Jewels
31j
Frequency
21,600 bph
Power Reserve
45 hours
Year
1991

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