This is a wonderful find, a rare vintage silver Nuvo planet with Alien Charm!
The silver cratered Planet opens to show an enamelled green alien, made by the well-known charm maker Nuvo. 
If you look closely, the alien is sticking his tongue out and waggling his hands with his thumbs towards his ears, in the time-honoured childish way of being cheeky.  
 
This desirable charm is beautifully detailed and closes securely.  It is in excellent condition with minimal wear to the enamel, and dates to the 1960s.  It’s stamped with the makers name and tests as sterling silver.  
 
Highly collectable and increasingly rare, particularly in this condition. Comes with a jump ring ready to attach to your bracelet.