Seiko Cal. 7138 - 556

The 7138-556 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 7138 caliber with 18j jewels beating at 36,000 bph, it delivers a 55 hours power reserve. [seikata-wm-53d99af768cc]

Also known as: Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

9.0mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

60m

Dial Color

White

Jewels

18j

Frequency

36,000 bph

Power Reserve

55 hours

Year

1971

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