Q is for Queensland used to Putney (of course!)
Both of these covers are addressed to Hassard Hume Dodgson, the uncle of author Lewis Carroll, and addressed to his house at Putney.
this 1866 cover, franked 10d per half ounce was posted Via Marseilles and re-addressed to Horsham upon arrival in Putney.
This 1877 cover, franked 6d per half ounce (double rate letter), was posted via Brindisi.
alec when I was listing on ebay for a local auctioneer we had many of those Exhibition postcards, the ones with special exhibition postmarks usually sell around the US$10 each, ordinary cards around US$5 each.
Jimbo nice to see you here, some of your old friends from the ebay café said to say HI