SMGL-3059 Point of Purchase Reichsparteitag 1937 Post card envelope Point of Purchase

This is a very hard to find item. This would have contained 8 Reichsparteitag post cards. Presumably the less expensive two-tone versions as it says “imprinted leaders mark” which to me sounds like the Adolf Hitler pre printed stamps. At the bottom it says 1 RM 52 Rpf goes to the Furhrer’s cultural fund.