Lot
559 
Mexico, Airmail, 1929, 25c violet & dark blue, perf 12, trial color proof, in combination with 1923, 5c & 10c View issue, horizontal pairs (644+645) on registered airmail cover to San Antonio, Texas, tied by "Servicio Aereo, Mexico, 1 Jun, 29" cds's, registry etiquette and reverse with transit date stamps and blue certification seal, Very Fine, On May 3, 1929 various proofs were sold at the Mexico post office for collectors (225 in all), however many were later used, these seldom come for auction, this cover was last sold in 1995. Scott No. C3 var. Sanabria No. 11 Estimate $750 - 1,000.
Realized: $900