Mexico, 1868 Hildalgo Reference Collection. Important collection of counterfeits, original plate reprints with forged overprints and postmarks, altered genuine stamps, color changlings, and an anotado forgery study, counterfeit splits of the 1868 issue with covers and expert certs signed by Louise Boyd Dale, Henry Trevor, and John Bash, original covers & photocopies of fake '68 split covers Eric Koenig acquired from J. Ruiz Perez, very useful notes for a specialist of the 1868 issue (no photo). Estimate  $1,000 - 1,500. $0