Seiko Cal. 0731 - 213

Released in 1981, the Cal. 0731 with design code 213 was part of Seiko's domestic market collection. Powered by the 0731 caliber with 34j jewels beating at 36,000 bph, it delivers a 59 hours power reserve. [seikata-wm-da7fb99fa32c]

Also known as: Sumo, Bellmatic

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

37mm

Case Thickness

10.2mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Black

Jewels

34j

Frequency

36,000 bph

Power Reserve

59 hours

Year

1981

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