what is the most uncommon errror

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Thank you for the link it is helpful to better understand the terms I wasn't familiar with.

 

Since there are several hundred basic error types, numerous subtypes, and an infinite number of combinations and permutations, unique errors are not hard to find.

 

My bet would be a post 1990 rotated die penny.. if people suggest it is mules, at least they know they exist.. it seems no one knows that 1990+ rotated die pennies exist since they changed plates at the post office where it would be nearly impossible to happen.. I've come across one, but no one knows anything about it

 

Im guessing post office = US Mint here

 

Rotated die errors are by no means unknown among post-1990 coins. Several have been reported among 1994 cents. I've seen dimes and nickels of recent vintage with severely rotated dies.

 

hmm those that reported 1994 (same year i have - 1994p XF 180 deg) has anyone came up with a price range?

 

I am new to the coins. You are talking about die rotation errors. Recently I purchased a Trade Dollar on a flea market. It looks authentic to all my friends. It has 180 degree rotation error. Also it has a double print of the eagle side. I think it's been minted in San Francisco because it has a mark above 'D' in Dollar. However, because it was double printed S looks like I. So, how rare is double print and die rotation error on the same coin. How much could it cost?
Thanks,
Igor

P.S. I tried to take a picture of it but my camera doesn't allow me to take good pictures of the coin.