That would of been the Governor Generals car. The crown representing the Queen.
The Prime Ministers is 'C 1' (Commonwealth One)
Out of nearly all the plates avaliable, i would choose to purchase the 'QLD' Q Plates. Because they were the sets of plates released in 1921 to 1955. From what I have seen they are the ones that are rising in value and are sought after.
For example:
'Q21' sold for $97,000, 'Q575' sold for $25,000, 'Q890' sold for $15,000. This was back in 2007 at the official PPQ auctions.
'Q2' and 'Q3' were passed in for $280,000 and $270,000 respectively back in 2005.
'Q1' owner was rumored to have turned down a $1m+ offer on it. He had it on his Porsche for a bit, but now resides on his Bentley.
I have been watching the QLD number plate market for a while now, and am looking/waiting for the right 'Q' plate to pop up. Lowest number possible with the amount i'm willing to pay.
All the ridiculously stupid prices people have on their 'personalised' plates (NVS42 or shit like that) are just that, ridiculously stupid.
And i can't believe there are still people stupid enough to 'buy' NSW plates.