I don't think you can go by how long it was produced but by how many of it were made..and that depends on the company. Like Paolo said, the Mcdonald smurfs were mass produced for one year...they are very common.
But we do know that Schleich produces a certain number of smurfs each year (don't know the number though) so the less years they produce a smurf, the rarer they will become.
As a rule of thumb, I go by how often you see them pop up on ebay..and how many smurf sellers (web stores) have them in stock. In other words, I base the rarity of a smurf on how easy it is to get
Maureen
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