I have that headshell - It came on a Nivico turntable, the SRP 471E3. Even though it has a ten inch platter, it has an eddy current speed control, and a double idler system - the normal idler moves a fixed idler that is much deeper than any I've seen on a turntable - it looks like it might be a RTR capstan.
Anyone with one of these tables probably has noticed that the grommets in the motor/eddy current mechanism are done for. But AKer Tothness has very nicely made silicon replacements. I haven't had time to put mine in, but looking forward to hearing the table as it was meant to be.