When I was a teenager, I used to rummage through junk cars from the 40s and 50s...through the seats, under the seats, even behind the panels of the interior in the back seat, looking for (and finding plenty of) silver coins. I once pulled a 1937
Mercury dime out of the space behind one of these interior panels, and it was worn very much like that coin. The reverse was nearly gone. It had rattled about in that space for years, but had never flipped over.
Chance