Seiko Cal. 4428 - 729

Seiko 4428-729

This Hand-Winding model from 1972 features a 40mm Two-Tone case. With its 21mm lug width and 13.5mm profile, it sits comfortably on most wrists. [seikata-wm-4f1b55f38d07]

Also known as: Helmet

Specifications

Movement
Hand-Winding
Case Material
Two-Tone
Case Width
40mm
Case Thickness
13.5mm
Lug Width
21mm
Crystal
Hardlex
Bezel
Rotating
Water Resistance
70m
Dial Color
Silver
Jewels
17j
Frequency
36,000 bph
Power Reserve
71 hours
Year
1972

Related Models

seikata-wm-4f1b55f38d07