Seiko Cal. 6637 - 323

Seiko 6637-323

The 6637-323 is a sought-after Solar piece from Seiko's golden era. Powered by the 6637 caliber with 36j jewels beating at 28,800 bph, it delivers a 66 hours power reserve. [seikata-wm-2b717517bfc7]

Also known as: Tuna, Rally

Specifications

Movement
Solar
Case Material
PVD Black
Case Width
41mm
Case Thickness
13.5mm
Lug Width
19mm
Crystal
Hardlex
Bezel
Rotating
Water Resistance
200m
Dial Color
Silver
Jewels
36j
Frequency
28,800 bph
Power Reserve
66 hours
Year
1975

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