Distinguishing simple FSK and Manchester coding?
Yes it's Bi-Phase (Mark, Space or Invert) aka Manchester code which has this typical 1T,2T pattern with a preamble of 1T for clock freq and phase sync, where T= 1/2 bit.  The jitter tolerance depends on quality of clock stability and sampling or integration method.

FSK alternates f1,f2 for many cycles and the ratio of Δf/fbr (bitrate) gives a deviation ratio that improves conversion from SNR above CNR. 

Microchip implementation 

It certainly looks like "Manchester code"


This can be decoded with a 1.5T One-shot ( = 3/4 clock cycle time) and D FF and XOR gate IC on a breadboard or in software.   I made my 1st one in '76.