Certina - Special Tank - NOS - 1980's

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Technical specifications :
brand : Certina
year: 1980's
genre: unisex
movement: manual 
function: sub-second
case: gold-plated
case back: steel
outside crown: 24mm
with crown: 24.7mm
lug-to-lug: 33mm
thickness (including Crystal): 7.4mm
Lug width: 16mm
crown: original
bracelet: not original
Buckle: not original 
crystal: mineral (condition: 9/10)
water-resistant: no
box: no
paper : no
document: Atelier Victor invoice