That sounds like a perfect eBay item... somewhat odd and definitely unusual!
I'm betting that would do really well if you listed it both under the postcard and the doll category. I once saw a tiny toy metal truck that had been sent through the mail with a small postcard attached to it. It was listed in the postcard category and it sold for more than $100.
So, you never know...
Is the doll designed on both sides of the postcard? Or is it printed on one side with the writing and stamp side on the back? Sometimes, people saved those leather postcards and sewed them together to make pillows, but I've never seen a leather postcard that was printed with a picture on both sides.
Is the doll