Seiko Cal. 6691 - 728

The 6691-728 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6691 caliber with 21j jewels beating at 21,600 bph, it delivers a 69 hours power reserve. [seikata-wm-d8d0e3348d7c]

Also known as: Bullhead

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

36mm

Case Thickness

14.7mm

Lug Width

19mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

120m

Dial Color

Burgundy

Jewels

21j

Frequency

21,600 bph

Power Reserve

69 hours

Year

1997

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