Seiko Cal. 0731 - 220

This Automatic model from 1973 features a 37mm PVD Black case. Powered by the 0731 caliber with 27j jewels beating at 28,800 bph, it delivers a 47 hours power reserve. [seikata-wm-5f9b0c95d3af]

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

37mm

Case Thickness

12.8mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Green

Jewels

27j

Frequency

28,800 bph

Power Reserve

47 hours

Year

1973

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