NSDAP Reichs-Parteitag stamps - would be purchased by a proud member to support costs of organization of the annual grand event in Nürnberg - NSDAP Party Rally. This stamps would be pasted on a membership card or in a book (Spende in 1935 edition, special field in 1939 edition). Since seizure of power (1933) they happened in the first half of September).
Avalilable for the number of years.
Stamp can come clean, or stamped "NSDAP bezahlt" (they would be normaly stamped if in a book or card).