Seiko Cal. 4528 - 742

This Spring Drive model from 1977 features a 39mm Two-Tone case. Powered by the 4528 caliber with 34j jewels beating at 28,800 bph, it delivers a 48 hours power reserve. [seikata-wm-13d2d003b107]

Also known as: Shogun, Helmet

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

39mm

Case Thickness

11.5mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

150m

Dial Color

Navy

Jewels

34j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1977

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