I'm a fan of Bill Atkinson's PhotoCard.app; I send one weekly to my father, currently in long-term care. I love the fusion of ancient Egyption and modern American tech.
So I appreciated discovering a 100 year old PhotoCard in my father's effects. This print is a (way) pre-photoshop overlay of my father's Uncle Max and his mates on an 'ISOLATED' image.
On the back of the print is the stamp that made it a 1914 PhotoCard - with a section for postage and for a note. (In this case it was never stamped).
Hard to believe there will still be postal delivery in 100 years, but maybe Amazon will stick them in packages.