Seiko Cal. 6166 - 657

The 6166-657 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6166 caliber with 20j jewels beating at 21,600 bph, it delivers a 72 hours power reserve. [seikata-wm-7590df167baa]

Also known as: UFO, Bellmatic

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

46mm

Case Thickness

10.8mm

Lug Width

21mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

40m

Dial Color

White

Jewels

20j

Frequency

21,600 bph

Power Reserve

72 hours

Year

1991

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