US Scott 9x1 with A.P. on back ????
The above image shows the back of a stamp which otherwise appears to be a US Scott #9x1 with the typical ACM initials on the front. Does anyone know what if any significance is represented by the A.P. (apparently in pencil) on the back. Those initials would appear to me to be relatively recently made, but I have no idea what that may mean...if anything. Thanks for any help in this. Ken
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