Seiko Cal. 6637 - 745

Seiko 6637-745

The 6637-745 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6637 caliber with 21j jewels beating at 36,000 bph, it delivers a 69 hours power reserve. [seikata-wm-ff03f0a2331c]

Also known as: Crown, Arnie

Specifications

Movement
Spring Drive
Case Material
Titanium
Case Width
43mm
Case Thickness
10.3mm
Lug Width
22mm
Crystal
Hardlex
Bezel
Fixed
Water Resistance
200m
Dial Color
Blue Sunburst
Jewels
21j
Frequency
36,000 bph
Power Reserve
69 hours
Year
1998

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