Its not easy for me to figure-out what I'm looking at here.
Sure, the Cinderella is a NOCPLA Type I, but:
My first thought was that the cards traveled under cover - if they traveled at all - hence the lack of postage or postmark.
But, then, why did the sender - perhaps Mr Serkal (a/k/a Szerkal) himself - bother to hand-write his change-of-address, as if the card were forwarded by the post office?
A wise man once said: Never ask how they got that way ;)