Seiko Cal. 6640 - 850

Seiko 6640-850

This Spring Drive model from 1993 features a 41mm Two-Tone case. The Bidirectional bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-581277d91559]

Also known as: Golden Tuna

Specifications

Movement
Spring Drive
Case Material
Two-Tone
Case Width
41mm
Case Thickness
10.4mm
Lug Width
20mm
Crystal
Sapphire
Bezel
Bidirectional
Water Resistance
140m
Dial Color
Silver
Jewels
31j
Frequency
21,600 bph
Power Reserve
43 hours
Year
1993

Related Models

seikata-wm-581277d91559