Seiko Cal. 6640 - 918

Seiko 6640-918

This Solar model from 1973 features a 35mm Hardlex-Coated Steel case. The Inner Rotating bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-05623f26e450]

Also known as: Helmet, Baby Tuna

Specifications

Movement
Solar
Case Material
Hardlex-Coated Steel
Case Width
35mm
Case Thickness
10.6mm
Lug Width
22mm
Crystal
Mineral
Bezel
Inner Rotating
Water Resistance
50m
Dial Color
Blue Sunburst
Jewels
31j
Frequency
28,800 bph
Power Reserve
43 hours
Year
1973

Related Models

seikata-wm-05623f26e450