Seiko Cal. 7156 - 421

The 7156-421 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 7156 caliber with 27j jewels beating at 28,800 bph, it delivers a 57 hours power reserve. [seikata-wm-83ae5a93e1a7]

Also known as: Bullhead

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

36mm

Case Thickness

12.4mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Champagne

Jewels

27j

Frequency

28,800 bph

Power Reserve

57 hours

Year

1974

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