Belgium β OBP 724S with double overprint
OBP 724S with double overprint "β 10%"For OBP 724R, a black overprint was used, and for 724S & 724T a red one was used.For this 724S stamp, a black overprint was accidentally used instead of a red one, the mistake was noticed and a second (red) overprint was placed, which is why it has 2 overprints.Please see the scan for a good impression. Read More