Antimagnétique

Gold-plated cases from this era wear through; solid gold is hallmarked

Plated cases show base metal at the lugs and caseback rim, which is honest wear. Solid gold cases carry the hallmarks of their country of assay, and those hallmarks are the evidence for the metal claim — not the colour, and not a stamped fineness alone. Where hallmarks are absent on a case claimed as solid gold, the claim is unsupported.

Redials are the dominant problem on vintage Tissot, not counterfeits

Values are low enough that whole-watch counterfeiting is uneconomic and high enough that a tidy dial adds real money, so the market's characteristic defect is the refinished dial. Signs are printing that sits on the surface rather than in it, a minute track that does not quite reach the edge, lettering with modern proportions, and — the most reliable single indicator — Antimagnétique or Swiss Made positioned differently from period examples. A redial is a restoration finding. It is also extremely common, and reporting it as a fake watch would be wrong.