Seiko Cal. 5681 - 665

The Seiko 5681-665 represents an important milestone in Seiko's 1966 lineup. Powered by the 5681 caliber with 33j jewels beating at 36,000 bph, it delivers a 64 hours power reserve. [seikata-wm-11d3ae4cb8cd]

Also known as: Bellmatic

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

46mm

Case Thickness

14.3mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

110m

Dial Color

Navy

Jewels

33j

Frequency

36,000 bph

Power Reserve

64 hours

Year

1966

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