Seiko Cal. 4561 - 771

The Seiko 4561-771 represents an important milestone in Seiko's 1978 lineup. Powered by the 4561 caliber with 20j jewels beating at 36,000 bph, it delivers a 51 hours power reserve. [seikata-wm-0046af292913]

Also known as: Tuna, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

11.4mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

70m

Dial Color

Burgundy

Jewels

20j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1978

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