Seiko Cal. 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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