Summary: that each of the 50 States had its own stamps and rates so a person mailing a letter from Pennsylvania to New York could buy a stamp that only paid for the travel to the Pennsylvania border Imagine then that for the portion of travel owed to New York State the sender had to file with the tax administrator of the State into which such shipment was made no later than the 10th
Image Dimensions: 176 x 170
Image originally found here.