Seiko Cal. 6633 - 721

The 6633-721 is a sought-after Quartz piece from Seiko's golden era. Powered by the 6633 caliber with 20j jewels beating at 36,000 bph, it delivers a 44 hours power reserve. [seikata-wm-30ab6b6939ee]

Also known as: Samurai, Bellmatic

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

10.5mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

160m

Dial Color

Green

Jewels

20j

Frequency

36,000 bph

Power Reserve

44 hours

Year

1978

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