Cover franked with 1868 12c black on green and 50c black on yellow HIDALGO issue with 'Thick Figures of Value' pin-perf with '1 70' invoice number and 'MEXICO' district overprints (SG 73 & 75) both tied by somewhat unclear MEXICO CITY cds's. Addressed to LEON. Cover is missing some of the backflaps. A scarce issue on cover.