Seiko Cal. 6637 - 591

Seiko 6637-591

The Seiko 6637-591 represents an important milestone in Seiko's 1973 lineup. Powered by the 6637 caliber with 21j jewels beating at 36,000 bph, it delivers a 44 hours power reserve. [seikata-wm-ea9353ac7a83]

Also known as: Sea Horse

Specifications

Movement
Kinetic
Case Material
Hardlex-Coated Steel
Case Width
45mm
Case Thickness
11.4mm
Lug Width
22mm
Crystal
Sapphire
Bezel
Coin-Edge
Water Resistance
180m
Dial Color
Silver
Jewels
21j
Frequency
36,000 bph
Power Reserve
44 hours
Year
1973

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