Ahh I could see the 950 but couldn't quite make out the preceding letters. Thanks.
That last picture - PL965 - is interesting. The Spifire files don't show it having served with the USAAF. I have it as 16 Squadron and then RNethAF. And then its subsequent history
warbirdregistry.org - A Warbirds Resource Group Site - Supermarine Spitfire
Do you know when the photo was taken and why it has US markings?