Yea that stylus doesn't look familiar. Definitely different than the RCA I remember. The stylus is actually elongated and glides on top of the recorded wave and the back of the stylus is a metal strip that is like one plate of a capacitor. The recorded disc is conductive and the undulating groove is the other plate of the capacitor so you actually have a variable capacitor tuning an oscillator that forms an FM signal. Quite an ingenious design. The R & D took too many years to develop and the optical laser system was born and overtook it.