Seiko Cal. 4561 - 771

Seiko 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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