Seiko Cal. 6647 - 690

The 6647-690 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6647 caliber with 21j jewels beating at 28,800 bph, it delivers a 41 hours power reserve. [seikata-wm-a2d38a91f1e1]

Also known as: Bullhead

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

36mm

Case Thickness

8.4mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

30m

Dial Color

Navy

Jewels

21j

Frequency

28,800 bph

Power Reserve

41 hours

Year

1972

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