Seiko Cal. 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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