Seiko Cal. 6633 - 443

Seiko 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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