Seiko Cal. 6636 - 260

Seiko 6636-260

The 6636-260 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6636 caliber with 21j jewels beating at 28,800 bph, it delivers a 60 hours power reserve. [seikata-wm-ff30df8db5ed]

Also known as: Tuna, Helmet

Specifications

Movement
Automatic
Case Material
Gold-Plated
Case Width
37mm
Case Thickness
13.1mm
Lug Width
19mm
Crystal
Hardlex
Bezel
Fixed
Water Resistance
200m
Dial Color
Burgundy
Jewels
21j
Frequency
28,800 bph
Power Reserve
60 hours
Year
1973

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