European Watch Clock and Jewellery Fr 1974 BF 123
Tissot’s ambitious project was to build a watch whose movement and looks would withstand both the passage of time and the wear and tear of everyday use. It has succeeded: a case with a hardness 5 times greater than steel’s, equipped with a tempered mineral crystal, has been fitted with a PR (“Particularly Rugged”) movement.
Water-resistant to 5 atmospheres, selfwinding movement. (TISSOT PR 518)