Here is a brand new old stock factory sealed Vintage Philmore LM 100 Lapel Type Crystal Microphone Mic NOS 1950s Specs Freq Resp  70-8000CPS Sensitivity -50 db Weight 1 1/2oz Weight 1 5/8" x 1/2" High Impedance non directional with Lapel Spring Clip and 5 ft shielded cable, from Philmore Manufacturing Co of Richmond Hill 18 NY made in Japan