Vintage 1960’s Calrad 500C crystal pill microphone Hi Z w box & cable Argonne #2
You are looking at an older Calrad 500C model crystal microphone from the 1960's era. The 500C has a classic pill shape design that was very popular back in the 1940's and 50's especially with the older RCA models of that era but the RCA mics were very high quality ribbon mics and very expensive.