Seiko Cal. 5648 - 528

This Spring Drive model from 1975 features a 41mm PVD Black case. The Rotating bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-2c529df54fe8]

Also known as: Tuna, Helmet

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

41mm

Case Thickness

13.8mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

60m

Dial Color

Champagne

Jewels

33j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1975

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