Actually, I believe there are "legit" copies of Sputnik out there, manufactured in the (former) Soviet Union.
When we lived back in Eastern PA, I remember an article in the Allentown newspapaer one weekend in their science section, about a small antique store located in Kutztown PA that had one on display (not sure if it was for sale). I don't remember details as to how many they said existed, or exactly why it was made.
I know where the store is, but never got a chance to go check it out.
