The best picture of all 3 of the smurfs from Ex In Co made in 1959 is probably this one, borrowed from the forum Barrufet sent a link to.
As you see they were made from the same mold just painted different. At least it looks like that??
They seems to have been sold between 1959 and around 1965/1966.
And because of the material these are most likely very very hard to find in good condition. The bad thing is that if you find them in a bag and perfect condition, you would have to store them still in the bag, and in a dark place with high and correct humidity???