Seiko Cal. 4428 - 631

The 4428-631 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 4428 caliber with 19j jewels beating at 28,800 bph, it delivers a 52 hours power reserve. [seikata-wm-d5e122809ff1]

Also known as: Silverwave, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

8.9mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

190m

Dial Color

Navy

Jewels

19j

Frequency

28,800 bph

Power Reserve

52 hours

Year

1965

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