Seiko Cal. 4481 - 528

This Spring Drive model from 1975 features a 37mm Two-Tone case. Powered by the 4481 caliber with 34j jewels beating at 21,600 bph, it delivers a 62 hours power reserve. [seikata-wm-bf7532ba776a]

Also known as: Sumo, Rally

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

37mm

Case Thickness

11.4mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

190m

Dial Color

Black

Jewels

34j

Frequency

21,600 bph

Power Reserve

62 hours

Year

1975

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