Overview
Brand: Seiko
Model: 1977 6139 'Helmet' Chronograph
Reference: 6139-7100
Movement: Seiko 6139 Automatic Chronograph
Case Width: 40.5mm
Lug Width: 20mm
Case Material: Stainless Steel
Crystal: Mineral
Dial Colour: Black
Water resistance: Not recommended due to age
Bracelet/Strap: Bracelet
Bracelet Wrist Size: 20 cm
Condition: 7/10 Light wear to the bracelet and case
Age: 1977
Box and Papers? Generic Box