Seiko Cal. 6644 - 366

The 6644-366 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6644 caliber with 29j jewels beating at 36,000 bph, it delivers a 42 hours power reserve. [seikata-wm-76df8c38a402]

Also known as: Sumo, Emperor

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

9.6mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

70m

Dial Color

Black

Jewels

29j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1979

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