Seiko Cal. 6644 - 691

The 6644-691 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6644 caliber with 32j jewels beating at 36,000 bph, it delivers a 40 hours power reserve. [seikata-wm-d5216eb2a828]

Also known as: Crown

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

14.9mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

120m

Dial Color

Silver

Jewels

32j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1965

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