Seiko Cal. 7181 - 637

Seiko 7181-637

The 7181-637 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 7181 caliber with 22j jewels beating at 36,000 bph, it delivers a 52 hours power reserve. [seikata-wm-6a4efc306dd4]

Also known as: Shogun, Helmet

Specifications

Movement
Hand-Winding
Case Material
Titanium
Case Width
42mm
Case Thickness
11.6mm
Lug Width
18mm
Crystal
Sapphire
Bezel
Inner Rotating
Water Resistance
130m
Dial Color
Navy
Jewels
22j
Frequency
36,000 bph
Power Reserve
52 hours
Year
1967

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