Seiko Cal. 4538 - 657

The 4538-657 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4538 caliber with 22j jewels beating at 21,600 bph, it delivers a 50 hours power reserve. [seikata-wm-ac6e9100f9da]

Also known as: Sportsmatic, World Timer

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

43mm

Case Thickness

14.4mm

Lug Width

19mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

110m

Dial Color

Black

Jewels

22j

Frequency

21,600 bph

Power Reserve

50 hours

Year

1980

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