Hey again! Just wanted to see what everyone thinks about this coin -- and confirm that it is in fact an error coin. Thanks for your time and input, as always.
Have you checked varietyvista.com yet? Looks like it could be DDO -002, rpm-005. The site also has Die markers.
http://www.coppercoins.com/diesearch.php Here's a link that will help you find your cooper errors. Just go to the home page and the link to varieties on the left side search by date, MM, DDO, DDR etc. really helpful sight. Nice find. I was just looking at that before I saw your thread, I have a couple of BU rolls I've been thinking about searching.
This is it. Congratulations on a nice find. http://www.coppercoins.com/lincoln/diestate.php?date=1957&die_id=1957d1do002&die_state=eds
Thanks everyone! Nice resources, Thanks for that as well. I ended up finding one more 1957-D that looks like it could be an RPM as well, but having trouble matching it up with any die markers. Any ideas? PS. I'm assuming this is probably machine doubling since I can't find any RPM listings for that year (1989-D), but could anyone confirm for me whether that's the case on the picture below as well? Thanks for all your help, I really appreciate it!
The 1989 looks like a plating crack. Very common and often mistaken for an RPM. After a few more years it will turn green where the zinc is exposed..