Although this microphone is of antique design (carbon button), harking back to the early years of the 20th century, it was in fact manufactured around 1950. The Dulci Company also manufactured a crystal radio receiver! Both of these devices allowed the enthusiastic hobbyist to explore bygone technology, whilst making a great deal of crackling and whistling!! A cousin of mine had a crystal set, and every now and then, amidst great excitement, we actually managed to find a radio station (usually foreign)!!
I was hoping to produce a short recording of the above microphone but the hum-to-signal ratio is overwhelmingly in favour of the hum! Sounds like I’m talking from Mars!!