Vintage Gold letter M pin w crystals

NWOT Beautiful gold initial M pin, with 16 white crystals (not sure what white stone is). Comes with original box from 1928 Jewelry Company. Very sweet detailing and one small dark spot in gold on the second upslope of the M. Beautiful condition. 1" tall / 1/2" at top of M, 1" At bottom of M See listing of same brooch in letter H.