Knopfler is great.
You could be right, the 347 is very similar to the 335, with the main difference being the coil-tap switch. I tried googling it, but couldn't find anything with him and a 347.
My first guitar was a '62 Strat that I bought in '64. I let my little brother take it to Tucson in the early '70's and never saw it again. He passed a couple of years ago, and when I was there to help settle his estate I couldn't find it anywhere. His friends told me that he'd sold it to Bonnie Raitt, but he was pretty good at spreading BS, so it might be true and might not.
If it is true, I guess my old Strat has a good home. :-)
Sometimes I get a little nostalgic when I think of all those '60's and '70's Strats, Tele's, and Gibsons we bought, sold, and traded.