Russians ordered that captured Panthers and Tigers be used until they broke down and then be abandonded. However, captured MK-IVs when broken down were to be repaired and returned to service.
Also, MK-IVs were still showing up on mid-East battlefields as late as 1973. Not the case for Panthers and Tigers.
The French and several Eastern Block nations used captured Panthers through the late 1940s but only until inventory of spares parts had been used up.
That is cool...
I knew the Arabs were using Mk IVs in the first Arab-Israel war, but 1973?