Cooky, Zennia, that is a fabulous postcard. And your right, it is a mini work of art. I can see that hanging in your sewing room.
I think I have figured out how to display mine. I think I am going to get felt/by the yard for my base. So the postcards will kind of "stick" to it. And, then I am going to put them into a poster frame. I just have to collect the materials. So far, they are in a basket in my dining room. (Which is connected to the L/R and Family Room.) I love being able to see and pick them up and read the backs every now and them.