Thanks for the help.I was looking on coppercoins.com and it has a listing for 1957 ddo#4. That looks like this but has no rpm.
1DO-004 is also 1MM-026: http://www.coppercoins.com/lincoln/diestate.php?date=1957&die_id=1957d1mm026&die_state=lds However, even though the chips (not CUDs) look similar, it can't be that die. The mint mark placement is way off. I don't see a listing for it. Based on the image, it looks like an RPM though. Can you get any better pic?
Thanks for the info jay. Sorry it took so long to reply. I had to look in the pile for it.Here it is hope it's a little better.With my scope if you get to close u can't see anything at all because it's way to bright.I'am also posting a 1956 d with a misplaced mint mark tell me what you think.