I think Simon's on the right track on the silver and gold ones, I thought the same thing, when I saw the pictures. There was a French coffee called Mocarex that had plastic figures made and offered them in packages of their coffee. I think there were others, too, and also, I think there was a laundry soap maker who did the same thing. I think Custer had or has many of those in his collection.
But I don't know if the English inscriptions indicate some other origins, too. I do think they were premiums, though, that is, I don't think they were sold as individual figures in their own right.
And speaking of the Bicentennial, does anyone remember plastic figures given away by the old Atlantic gas stations back then? And there was also a toy Noah's Ark set. Atlantic then rebranded as Arco (for Atlantic-Richfield), and then eventually, they got bought by someone else, maybe Sunoco.
Sorry, I've digressed, prosit!
Brad