Apam is located in the state of Hidalgo. It was the 33th largest postal district, based on the number of stamps used, and 34th by total value of all stamps used. The average cost of the stamps used was 1.80 reales.
Apam had 4 sub-offices: Chignauapan (Chignahuapan), Otumba, Soltepec, and Teotihuacan.
|Distribution vs. all stamps||0.79%||0.38%||0.18%||0.29%||0.89%|
The Apam overprint is approximately 9 by 2 mm. It was often applied in the margin between stamps, but also both horizontally and vertically on the stamp. The overprint is known in black. APAM between two square blocks is believed to be a forgery, most likely applied to unoverprinted remainders or reprints.
On average, the stamps have large margins for the issue.
Forgeries of the black Apam overprint exist.
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