Seiko Cal. 6644 - 412

Released in 1969, the Cal. 6644 with design code 412 was part of Seiko's domestic market collection. Powered by the 6644 caliber with 20j jewels beating at 21,600 bph, it delivers a 63 hours power reserve. [seikata-wm-324fe85aa90e]

Also known as: Tuna, Crown

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

36mm

Case Thickness

11.4mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

120m

Dial Color

Champagne

Jewels

20j

Frequency

21,600 bph

Power Reserve

63 hours

Year

1969

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