It doesn't appear to be a proof coin, but as @Dave363 stated, a nice circulated coin. Half the circulated dimes for that year were from Philly and they didn't have a mint mark. The P mint mark on Rosie dimes didn't appear until 1980. You have a good eye, keep up the search.
I never polished it. I obtained it from a liquor store and thought it was beautiful for being so old it wasn't until I looked it up that I realized the value it may have held. The pictures don't really do it much justice it's beautiful. I really don't have my Hope's up that's it is a proof I doubt that it is but I wanted to see if anyone thought it was special
Here are 2 more pictures for the person who asked for better pictures. I think it's fantastic for its age and sad that it's not a proof but it's so nice.
I'm not saying you polished it. But it looks to be polished. Which would ruin it if it had any value over a dime, which I don't think it does.
It’s not a proof. Just a regular minted Philadelphia dime. Somebody probably took some jewelry polish to it. It’s worth face value.
