Seiko Cal. 5691 - 765

The 5691-765 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 5691 caliber with 25j jewels beating at 21,600 bph, it delivers a 64 hours power reserve. [seikata-wm-cc20082584cf]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

45mm

Case Thickness

13.7mm

Lug Width

19mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

110m

Dial Color

Black

Jewels

25j

Frequency

21,600 bph

Power Reserve

64 hours

Year

1975

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