Seiko Cal. 0721 - 928

Released in 1981, the Cal. 0721 with design code 928 was part of Seiko's domestic market collection. Powered by the 0721 caliber with 23j jewels beating at 28,800 bph, it delivers a 56 hours power reserve. [seikata-wm-2d3415eb95fa]

Also known as: Sumo, Emperor

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

11.5mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

80m

Dial Color

Navy

Jewels

23j

Frequency

28,800 bph

Power Reserve

56 hours

Year

1981

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