A tell tale sign of mechanical doubling is that the doubling is "flat, shelf-like".
I know what your dime looks like to me, but what does it look like to you in person?
In person, it doesn’t look flat at all. I believe I’ve found the same dime, yr and what not, that has an actual machine double, and compared the two. The ones on my dime definitely stick out, not flat like the other one. I’ll post pictures of the, hopefully they help they help figure out weather or not it’s an actual dd.
Better close ups!!
Flat and shelf-like is usually mechanical doubling.
14th post in this thread is a good reference between a doubled die (DD) and mechanical doubling from Coneca. https://forums.collectors.com/discussion/1006619/sticky-this-book-index-books-to-read-on-numismatic-series-and-varieties