Seiko Cal. 6391 - 717

Seiko 6391-717

This Automatic model from 1978 features a 35mm Hardlex-Coated Steel case. The Coin-Edge bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-a13eeb185d48]

Also known as: Tuna, World Timer

Specifications

Movement
Automatic
Case Material
Hardlex-Coated Steel
Case Width
35mm
Case Thickness
8.4mm
Lug Width
21mm
Crystal
Sapphire
Bezel
Coin-Edge
Water Resistance
180m
Dial Color
Navy
Jewels
17j
Frequency
28,800 bph
Power Reserve
43 hours
Year
1978

Related Models

seikata-wm-a13eeb185d48