Wiktionary
overstamp
vb. To apply a stamp over existing text.
Usage examples of "overstamp".
In one of the Chinese shops along the Kesawan, I found a can of Argentine corned beef, heavily overstamped ‘NAAFI’, going for thirty guilders, or almost three pounds sterling.
Shannow walked out along the trail and a hundred paces from the camp he saw a hoofprint from the lone horse which had overstamped a previous print.