Machine doubling due to the fact that the mint mark has doubling the same as the 50 in the date. Mintmarks were hand punched into the die after it was made.
@Don W. Welcome to the neighborhood! If it looks "flat and shelf-like", it is machine doubling. Chris
Because the mm was punched into the finished die , there are close to zero chances that both were doubled by random chance, but like the lottery , sometimes there is such a coincidence and a winner. To my knowledge this is by far the best example. 1960-D DDO-001, with a wide spaced RPM which makes it easy to determine. Jim
Welcome to Coin Talk. IMO your coin is not a Doubled Die. As others have said it looks like Mechanical (or Machine) Doubling. Here's a site to help you learn the difference: http://doubleddie.com/144801.html On the left hand side click on Doubled Die Listings to see what real DD's look like.
Thanks to all. I had a feeling it wasn't to be but still wanted to be sure. I appreciate the feedback and the link!