P.s on observe side by the dot and the o inone is and indent kinda half round what may have caused it.
Something put a recess on the die in that spot. A die gouge. ONE is located on the reverse not the obverse. The anomalies you are seeing on your dime are fairly common among Roosevelt dime coinage. There is no extra premium for those types of errors.
Thanks i do know that dimes have a lot of anomalies just didn't see one like this. So what would make a dime more collectable with so many with anomalies Lol REVERSE