Seiko Cal. 6644 - 270

The Seiko 6644-270 represents an important milestone in Seiko's 1971 lineup. Powered by the 6644 caliber with 23j jewels beating at 21,600 bph, it delivers a 66 hours power reserve. [seikata-wm-0ce0286e80df]

Also known as: Bullhead

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

15.8mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Silver

Jewels

23j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1971

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