Seiko Cal. 6661 - 646

The 6661-646 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6661 caliber with 20j jewels beating at 21,600 bph, it delivers a 45 hours power reserve. [seikata-wm-a1a23c295e46]

Also known as: Bullhead, UFO

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

46mm

Case Thickness

12.6mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

100m

Dial Color

Burgundy

Jewels

20j

Frequency

21,600 bph

Power Reserve

45 hours

Year

1970

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