http://varietyvista.com/02b LC RPMs Vol 2/1979DRPM001.htm From CRH no silver or W'sBut this is much better then the wheaties and average old nickels.Pictures are a little fuzzy but it's clearly it,I still have a lot to go through.
Yours doesn't appear to have the same form as the listed one. Also your MM seems to be a bit too far left and without the die scratches under Liberty.
I don't see any die scratches yes but it looks correct to me and the mint mark placement,any RPM enthusiasts?.
http://www.error-ref.com/broken-punch/ The rpm for the 1979 D is south/southeast. Don't see it on your coin.
It could possibly just be a different die state not noticed.They basically look the same,one more try(@Rick Stachowski).
http://www.coppercoins.com/lincoln/diestate.php?date=1979&die_id=1979d1mm002&die_state=mds I see some interesting characteristics but it's not it. Vertical die scratches around Liberty extending to Lincolns neck.Also some more die scratches from Lincolns jacket going into the date,possibly a new variety?