My Second Error Ever In Less Than 1 Week? 1975 Dime

I think this is the result of a misaligned die. Off-center strikes have have both sides of the coins aligned but not centered on the planchet.

Dimes like yours are common and not worth a premium. The coins that are worth a bit are the ones where some of the design of the coin is actually missing and the more the better.

I have some like yours that I keep. I think it would be fun to put together a little set of them if I can get one from each year for a decade -- maybe.

with the above assessment.

This is an error ... but a very common mis-aligned die strike.

Fun to keep if you wish as a curiosity ... but not worth any numismatic premium.

David