Mexico, 1913, 5c Sonora, perforated 12, bottom margin single, without gum as issued, exceptional freshness, Very Fine, a lovely example of this mint Civil War issue rarity, Follansbee asserts in his book that less than five unused are known; with photocopy of 2008 MEPSI certificate for pair. Scott No. 321  $4,250. $0 (Image)

Mexico, 1913, 5c Sonora, perforated 12, tied on piece by purple oval Naco town cancel, Very Fine, one of the five towns known to used this perforated variety; with 2021 MEPSI certificate. Scott No. 321  $800. $0 (Image)

Mexico, 1913, 5c Sonora, perforated 12, tied on piece by Cananea town cancels, Very Fine, one of the five towns known to used this perforated variety; with 2021 MEPSI certificate. Scott No. 321  $800. $0 (Image)

Mexico, 1913, 5c Sonora, perforated 12, "Centavob" error, tied on small piece by neat duplex postmark, well centered with naturak s.e. at top, Very Fine, very scarce; with 1988 MEPSI certificate. Scott No. 321a  $850. $0 (Image)