Difficult question to answer mc59.
No records exist of how many of each model were made - even in the Adelaide library where all the old GMH records are stored.
I have been collecting vehicle ID data for about 20 years or so and have about 3000 numbers stored. The main reason is to answer the question you have asked.
So in 20 years of collecting and over 3000 entries I have found just 7 FC 217's
To say that they are rare is an understatement
Of the 7, 2 are made in Sydney, 4 in Melbourne and 1 in Adelaide
199 is the highest in Sydney
292 is the highest in Melbourne
185 is the highest in Adelaide - yours is now the highest at 219
I have full details of the 292 car which is September 1959, however the 217 model did not run till the end of 1959 and I believe it finished in September some time, but I have no documented evidence.
Your car would be at the very end of Adelaide production - probably Sep 59
I estimate from my experience that there were about 300 cars each made in Sydney and Melbourne and maybe 250 made in Adelaide, it's probably less than this, say between 800 & 850 in total.
It would be very helpful if you could find a chassis number as then I could date it very accurately.
Also, what are the other numbers on the ID plate?
A lot of 217 models were special build - my FC 217 was an Army staff sedan .
Ken