Seiko Cal. 6660 - 121

The 6660-121 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6660 caliber with 28j jewels beating at 21,600 bph, it delivers a 69 hours power reserve. [seikata-wm-cbbb7f7327c4]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

9.6mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

100m

Dial Color

Cream

Jewels

28j

Frequency

21,600 bph

Power Reserve

69 hours

Year

1978

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