Seiko Cal. 0728 - 310

This Spring Drive model from 1973 features a 40mm Two-Tone case. Powered by the 0728 caliber with 21j jewels beating at 21,600 bph, it delivers a 41 hours power reserve. [seikata-wm-ea2e6818a67c]

Also known as: UFO, Sea Horse

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

40mm

Case Thickness

9.7mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

White

Jewels

21j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1973

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