Seiko Cal. 6640 - 918

Seiko 6640-918

This Spring Drive model from 1985 features a 39mm Two-Tone case. The Coin-Edge bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-0391874a8d29]

Also known as: Turtle, Baby Tuna

Specifications

Movement
Spring Drive
Case Material
Two-Tone
Case Width
39mm
Case Thickness
8.6mm
Lug Width
22mm
Crystal
Mineral
Bezel
Coin-Edge
Water Resistance
160m
Dial Color
Burgundy
Jewels
28j
Frequency
21,600 bph
Power Reserve
55 hours
Year
1985

Related Models

seikata-wm-0391874a8d29