This is Genuine California Placer Gold in his pan which is attached to the postcard. 

Real Placer Gold  - The good old days, they can't make nice postcards like this anymore, 

with gold now well above $ 4000 an ounce.  From the Late 1930's to the early 1940's. 

Size is : 5.5" x 3.25  >> Unusual & Interesting Curio item with Gold Dust attached.<<

This is a post card from and long time collection of gold rush ephemera