silly putty

there is a debate regarding the invention of this toy between iit + mit and it was only recently that i found out about it.
this is one of the first things i bought when i came to chicago [2-1/2y ago] because this used to be my favorite toy many decades ago. in fact it was not my toy, but my sister's. one of the few cool items she had and i did not; since i was the spoilt one ;]
i am wondering where did my mom discover it in greece?

some description about it:
"Classic Silly Putty in its original red plastic egg. Probably the simplest toy we sell - a plastic egg with some putty inside - yet, the possibilities are almost endless!
Silly Putty is a very unique substance. It stretches without breaking, yet it can be "snapped off" cleanly. It bounces higher than a rubber ball. It floats if you shape it in a certain way, yet sinks if shaped in other ways. It can pick up pencil marks from pages and comics from some newspapers. If you slam it with a hammer, it keeps its shape, yet if you push with light, even pressure, it will flatten with ease.
Silly Putty has been the standard of excellent fun since 1950.
Ages 3 and up"

$1.75
the most amazing aspect of it, is: "ξεπατίκωμα"[=that you pick up pencil marks from comics and newspapers]
my new one is green and is glowing in the dark.
plus you can make "physical architectural greg lynn style models" [at night]

have fun!

FYI: here