Well spotted Mike K!
Yes, there are a host of 'Defects' within the C-520XX registration series, but the registrations are mixed amongst a bunch of other stuff, so my notes about what was what are less than comprehensive. Half the series C-52070 to 52079 are Prefects, all with engine/chassis numbers like 'C221571', so the one pictured could be any one of 5 different vehicles. I noted that many were disposed of to the Department of Air by inter-agency transfer.
Keith: Perhaps the preponderance of Ford CMPs in that area of Victoria was simply a function of the locals knowing exceptional quality when they saw it??!!
(THAT should get the GM devotees fired up!!)
Mike C