Seiko Cal. 4428 - 631

Seiko 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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