i think you are trying to compare the terms "countermark" and "counterstamp" and i find that in use they can be used interchangeably......as a side note i find that countermark is used more on non-US issues while counterstamp is predominantly domestic
i believe that i once read that *mark would be struck obverse and reverse while *stamp would be only on one side (but i have seen so many diversion from this rule that it is hardly worth mentioning)
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i believe that i once read that *mark would be struck obverse and reverse while *stamp would be only on one side (but i have seen so many diversion from this rule that it is hardly worth mentioning)
www.brunkauctions.com
Counterstamp can be made by any old body.