Thanks PERF 12 for confirming my posting of 6-30-21 .That there are various types plus different printings . They call it a common stamp --sheesh !
Notice your article doesn't cover any of the different watermarks ,that BILLSEY confirmed to my original posting .I believe it was Dr. Matekja and his research group who identify this in a paper he wrote .
No telling where these two stamps have been since they were printed. If you really want to get into this thing about paper types it pays to get clean stamps, preferably mint and unused.
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Posted 07/11/2021 5:34 pm
