Seiko Cal. 4421 - 643

The 4421-643 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 4421 caliber with 18j jewels beating at 36,000 bph, it delivers a 55 hours power reserve. [seikata-wm-b203352f9bc9]

Also known as: Goldfeather, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

36mm

Case Thickness

15.8mm

Lug Width

19mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

40m

Dial Color

Navy

Jewels

18j

Frequency

36,000 bph

Power Reserve

55 hours

Year

1975

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