Seiko Cal. 0730 - 740

This Hand-Winding model from 1982 features a 40mm Hardlex-Coated Steel case. Powered by the 0730 caliber with 21j jewels beating at 28,800 bph, it delivers a 46 hours power reserve. [seikata-wm-638c61c3bf6e]

Also known as: Sumo

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

10.2mm

Lug Width

22mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Navy

Jewels

21j

Frequency

28,800 bph

Power Reserve

46 hours

Year

1982

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