This is a NSDAP Reichsparteitag Nurnberg 1933 badge in very good condition.
All of these badges had a productionfault, being a thin pin that was always soldered very sloppy and as such easily broke off. Most badge were resoldered sloppy again, a few had a pin plate soldered on to fix the problem. The one we have here has that too and as can be seen the reverse surface was first scratched to get a better grip for the solder to catch on.
Just a killer badge, executed in massive bronze and of great quality.