Seiko Cal. 4461 - 640

The 4461-640 is a sought-after Automatic piece from Seiko's golden era. Powered by the 4461 caliber with 35j jewels beating at 36,000 bph, it delivers a 36 hours power reserve. [seikata-wm-5b25a967d665]

Also known as: Sumo

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

35mm

Case Thickness

11.3mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Green

Jewels

35j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1968

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