Seiko Cal. 6633 - 651

This Spring Drive model from 1973 features a 44mm Titanium case. Powered by the 6633 caliber with 25j jewels beating at 36,000 bph, it delivers a 39 hours power reserve. [seikata-wm-6a04677b970f]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

44mm

Case Thickness

13.8mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

80m

Dial Color

White

Jewels

25j

Frequency

36,000 bph

Power Reserve

39 hours

Year

1973

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