Seiko Cal. 4561 - 740

The 4561-740 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 4561 caliber with 28j jewels beating at 36,000 bph, it delivers a 43 hours power reserve. [seikata-wm-063beb31cdc6]

Also known as: Sumo, Crown

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

34mm

Case Thickness

13.3mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Green

Jewels

28j

Frequency

36,000 bph

Power Reserve

43 hours

Year

1979

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