Seiko Cal. 0731 - 321

This Solar model from 1970 features a 41mm Two-Tone case. Powered by the 0731 caliber with 28j jewels beating at 28,800 bph, it delivers a 45 hours power reserve. [seikata-wm-dd34b3f7d754]

Also known as: Sportsmatic

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

41mm

Case Thickness

12.8mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

28j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1970

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