Seiko Cal. 3891 - 565

The Seiko 3891-565 represents an important milestone in Seiko's 1966 lineup. Powered by the 3891 caliber with 25j jewels beating at 36,000 bph, it delivers a 54 hours power reserve. [seikata-wm-8103dfcc13e5]

Also known as: Tuna, Helmet

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

39mm

Case Thickness

14.8mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Black

Jewels

25j

Frequency

36,000 bph

Power Reserve

54 hours

Year

1966

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