
to CCF!
These are referred to as 'chopmarks', not 'counterstamps'. The chopmarks were done by merchants to test if the coin was solid silver or only plated.
There are some issues to beware of:
1. Sometimes these marks are applied fraudulently. As in obtaining a genuine coin from the 1800s and stamping it in 2014 as if it were stamped in the 1800s. This is often seen when the stamps add significant value to the host coin. There is at least one
ebay seller from Spain who engages in this fraudulent practice.
2. Some coins are not genuine in the first place, but stamps are applied to distract the collector from examining the coin too closely. If the coin 'doesn't look right' the collector assumes it is due to the stamps, although the host coin is truly a worthless forgery.
Your coin's value is not significantly enhanced by the chopmarks, so they are probably not added 120 years later.
If your coin is not magnetic and has the appropriate diameter and weight I would consider it a genuine chopmarked coin.
-wheatiefan