"Schloss" with an upside-down back (or front depending on one's perspective
) I acquired while chasing the master set (shamelessly looking for about 10 more cards if you can help)..... I think it puts a nice accent on the set. I also acquired an N28 "proof" card from Leon after an auction to serve along with buffalo bill and annie Oakley as types to represent my sold set. Photoshop not cooperating at the moment.....
With regard to errors, goofs, or scrap like issues exhibited within "N" card groups - they are encountered far less frequently than one would expect - even when accounting for cruder manufacturing techniques and greater age. There were seemingly a LOT of name and identification errors though......