Without a doubt for me it's my 77 mastersport chameleon FTS. Only 9 made and it's such a stunning rifle to not only look at, but lovely to shoot.
These take years to find, but within 1 week I found another which I put my mate onto. Mine is number 6, I found him number 9 and he has just managed to get what was his dad's one back, which he sold in the late 80's, number 3.
Fozzy