Seiko Cal. 6640 - 678

Seiko 6640-678

This Solar model from 1977 features a 36mm PVD Black case. The Coin-Edge bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-7de044d5ae06]

Also known as: Navigator

Specifications

Movement
Solar
Case Material
PVD Black
Case Width
36mm
Case Thickness
8.8mm
Lug Width
20mm
Crystal
Hardlex
Bezel
Coin-Edge
Water Resistance
180m
Dial Color
Blue Sunburst
Jewels
20j
Frequency
21,600 bph
Power Reserve
58 hours
Year
1977

Related Models

seikata-wm-7de044d5ae06