i wonder if errors are a dime a dozen. in any case here's one and probably two. the last digit of the year on the roosevelt looks like the top half of a 7 - what kind of error is that? are either worth anything? neither are in any condition to write home about.
pmd from a coin wrapper - interesting notion, but there's no shadow or anything of where the bottom part of the 3 (not 7) used to be which seems peculiar. the mercury dime looks certainly seems a candidate for pmd. the obverse and edge of the coin are not affected.
The damage from a coin wrapper is common on silver and copper coins. The pics of the reverse, while it looks like it could be a couple of cuds, actually might be silver solder. It may have been a jewelry piece. Wait for others to chime in. I'd be interested to see what they say.
1942 merc, nothing special, but the solder notion seems likely. both sides show wear, but the obverse shows more wear, so perhaps the reverse was protected by being on the underside of the jewelry.
IMO it's a 1957 where the bottom part of the 7 has been moved. You can see partial line from where it was originally, and if it was a 3 it would have had to have the down diagonal stroke stop sooner, and have a curve like the 5 does. This one doesn't show that. = PMD of some sort, whether it is from a coin wrapper or some edge type striking this in a certain manner, I can't say. I have seen a lot of coins where the lettering or numbers have been moved and it doesn't look like it's deliberate. But still is PMD. As far at the reverse goes, it could be cuds, but I think it's just as likely as there is silver solder or something on that.
