Seiko Cal. 5639 - 636

Seiko 5639-636

This Solar model from 1971 features a 42mm Two-Tone case. With its 18mm lug width and 12.6mm profile, it sits comfortably on most wrists. [seikata-wm-2423a92af71d]

Also known as: Helmet, Navigator

Specifications

Movement
Solar
Case Material
Two-Tone
Case Width
42mm
Case Thickness
12.6mm
Lug Width
18mm
Crystal
Acrylic
Bezel
Fixed
Water Resistance
60m
Dial Color
White
Jewels
31j
Frequency
36,000 bph
Power Reserve
41 hours
Year
1971

Related Models

seikata-wm-2423a92af71d