Seiko Cal. 4420 - 872

The 4420-872 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 4420 caliber with 36j jewels beating at 21,600 bph, it delivers a 46 hours power reserve. [seikata-wm-9fa5ab01093a]

Also known as: Bullhead

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

8.8mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Blue Sunburst

Jewels

36j

Frequency

21,600 bph

Power Reserve

46 hours

Year

1973

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