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Authentication notes recorded against catalog references: what to examine, what it establishes, and how well evidenced it is. Every note links back to the reference it was written for.
B-Uhr aviation layout
IWC · Big Pilot · Ref. IW500901
Genuine dials follow the Beobachtungsuhr layout — triangle with two dots at 12, railway minute track and correct font weight. Off proportions or a printed logo indicate a fake.
Black vs Polar white dial
Rolex · Explorer II · Ref. 16570
Both black and white ('Polar') dials are factory-correct across the run; the luminous compound (tritium vs LumiNova) must match the production period.
Calendar apertures multiply the opportunities for a redial to go wrong
Universal Genève · Compax · Ref. Tri-Compax
A Tri-Compax dial carries more printed information than almost anything else of its era: two apertures, a pointer-date ring, register scales, a moonphase opening and the signature. A refinisher has to get all of it right, and the aperture edges and the moonphase opening are where the work usually shows — apertures very slightly the wrong size or position, printing that crosses a boundary it should not. Examine the apertures before the signature.