Thanks for rejuvenating this topic! I can add a couple Santa cards. The first is one of my favorites. Nothing special about the postmark, but I like the trolley in the background. The other intrigued me because Santa is dressed in green, not red!
In response to the post wishing people still sent out Christmas postcards -- I still do! Often you can find blank holiday cards in bargain boxes and I fish them out and save them until December to send out. They are less expensive than current Christmas cards, cheaper to mail, and my friends are all impressed when they get a century old postcard!