I was wondering what font was used in the NSDAP emblem.

Blood red transformed into pretty purple for this version of the image, but it is the same as the party logo shown on Wikipedia https://en.wikipedia.org/wiki/Nazi_Party#/media/File:NSDAP-Logo.svg
Note that use of the emblem in the central portion is prohibited in some counties.

Presumably custom lettered, in the style of a 20th century sans.