Seiko Cal. 5644 - 971

The 5644-971 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5644 caliber with 31j jewels beating at 36,000 bph, it delivers a 56 hours power reserve. [seikata-wm-0a26ca9f2788]

Also known as: Bullhead, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

12.2mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Green

Jewels

31j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1971

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