Seiko Cal. 6633 - 443

The Seiko 6633-443 represents an important milestone in Seiko's 1974 lineup. Powered by the 6633 caliber with 23j jewels beating at 36,000 bph, it delivers a 37 hours power reserve. [seikata-wm-0c23df031cf9]

Also known as: Sumo, Bullhead

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

44mm

Case Thickness

14.5mm

Lug Width

18mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Black

Jewels

23j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1974

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