This is supposed to be a golden membership pin. It has what looks like a transitional number, maker mark with M and an odd RZM with "11" under the "M". I've seen something like the 11 under M in Jo Rivett's Party Badge book where it was a "22" under the "M".
UPDATE: According to the first post on the first page of this thread, BM 1/122 is a fantasy badge. How many makers of the diamond-shape Hitler Youth membership badge were there? - Hitler Youth Militaria Collector Forum