Parts of it give me pause. Like the E in that Elvis. I'd get an expert opinion but under what circumstances would he even be signing the Christmas card like that? I see a lot of these old Christmas cards pop up that are genuine, but some forger just adds an Elvis signature to it to make it worth something.
Cheers Lads, I honestly didn't think it was but just to make sure as I've seen many different exemplars out there that are authentic and they are all slightly different.