Seiko Cal. 6633 - 640

Seiko 6633-640

The 6633-640 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6633 caliber with 26j jewels beating at 28,800 bph, it delivers a 62 hours power reserve. [seikata-wm-1e09f236add3]

Also known as: Panda, Bullhead

Specifications

Movement
Spring Drive
Case Material
Titanium
Case Width
34mm
Case Thickness
10.0mm
Lug Width
20mm
Crystal
Hardlex
Bezel
Fixed
Water Resistance
100m
Dial Color
White
Jewels
26j
Frequency
28,800 bph
Power Reserve
62 hours
Year
1966

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