It is a challenge that only specialists can achieve and very often they do not agree.
The counter stamped coins are the
II and
IIII Maravedis from Spain.
Very often they hammered the II Maravedis to make them bigger and look like a IIII Maravedis and stamped them with the stamp VIII.
Each coin can was very often stamped up to four times with single and doubled stamps.
It was very easy to stamp coins and the profit was high. Therefore, everybody stamped coins, including nobles and church.
It is very difficult and, in most of the cases, impossible to identify all the stamps.
For my use I have prepared a small resume of the stamps:
1st column over
II Maravedis, 2nd column over
III Maravedis