Seiko Cal. 4556 - 923

Released in 1976, the Cal. 4556 with design code 923 was part of Seiko's domestic market collection. Powered by the 4556 caliber with 29j jewels beating at 21,600 bph, it delivers a 40 hours power reserve. [seikata-wm-130b8ab5be12]

Also known as: Sumo, World Timer

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

40mm

Case Thickness

8.8mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Silver

Jewels

29j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1976

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