The Schön DM catalog is supposed to cover up to 1806, but there are many newer coins are listed in being in Schön DM.
Some examples:
Every instance I've examined from 1874 on listed in Schön DM should be Schön. (Note: not 1873, I'll change that to Kahnt/Schön after I verify the reference. And work on the other problem coins.)
Could someone mass move these coins from Schön DM to Schön?
For bonus points: Find out who added those references and educate them.