Seiko Cal. 7131 - 338

The 7131-338 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 7131 caliber with 21j jewels beating at 28,800 bph, it delivers a 55 hours power reserve. [seikata-wm-ca49b3fc0dee]

Also known as: Arnie

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

34mm

Case Thickness

10.5mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

50m

Dial Color

White

Jewels

21j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1970

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