Seiko Cal. 7138 - 556

Seiko 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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