Seiko Cal. 5660 - 678

The 5660-678 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 5660 caliber with 32j jewels beating at 28,800 bph, it delivers a 61 hours power reserve. [seikata-wm-b6be96314921]

Also known as: Bullhead, Emperor

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

10.0mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

180m

Dial Color

Burgundy

Jewels

32j

Frequency

28,800 bph

Power Reserve

61 hours

Year

1972

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