Lot
840 
Mexico, 1861, ½r black on buff, without district overprint, horizontal strip of four, canceled by two strikes of San Luis Potosi oval handstamp (Schatzkes 1445) on 1861 folded letter to Zacatecas, Very Fine and choice; signed Calves. Scott No. 6a Estimate $300 - 400.
Realized: $300