1957 D Cent Finned Rim?

Is it worth any premium or does it have the value of just an average wheat?

Suggestion, always crop your photos so your coin takes up the whole image instead of just a small portion in the center of your image. It is hard to tell for sure but it looks like your coin is damaged. If the outer part of the rim is not as high as the inner part of the rim then your coin was broken out of a lucky coin holder. The rim gets crimped into the holder damaging.

That is better but I still cannot tell for sure if the outer part of the rim is higher or lower than the inner part of the rim. A fin occurs when the pressure from the strike pushed metal up around the neck of the die so if this is a fin then the outer part of the rim will be high and thin (or knifelike). Which is it?

I guess the best way I can think of to explain this is to hold the coin on it's side and look at the edge. If it is a fin then you will just see a flat edge that is thicker because of the high fin. If it is damage then you will see a stepped edge with both outside edges smaller than the middle.

Also, the reason I don't think this is a partial collar is the step is on both sides. A partial collar occurs when the collar die does not rise to it's complete height giving you a correct diameter on one side of the coin and a larger diameter on the other side because of the metal flowing over top of the collar die.

I believe they were called " Encased Cents" or something like that. When the Wheat cent is removed you can examine the damage done after being crimped into its collar. Worth normal wheat value essentially ~10 cents imo