1970's Michell, Transcriptors HR Turntable, 33/45 RPM 60 Hz Strobe for USA, Used
This part will also work on the earlier Transcriptors Hydraulic Reference. The 60 HZ strobe has 40 marks on the outer and 31 on the inner of the wheel and the 50 HZ strobe has 35 marks on the outer and 26 on the inner.