Seiko Cal. 4561 - 510

The Seiko 4561-510 represents an important milestone in Seiko's 1977 lineup. Powered by the 4561 caliber with 34j jewels beating at 28,800 bph, it delivers a 56 hours power reserve. [seikata-wm-5dceaa224a37]

Also known as: Tuna, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

12.5mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

110m

Dial Color

Blue Sunburst

Jewels

34j

Frequency

28,800 bph

Power Reserve

56 hours

Year

1977

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