Error Coins In Circulation?

Are you referring to true errors(off center, incomplete planchet, split clad layer, brockages, etc) or die varieties(doubled dies, RPMs, OMMs, etc)? I ask because a true error is definitely not easy to find, especially with new Mint procedures in place to stop their release. Most people commonly refer to die varieties as errors though and those can be found because they are not so obvious as the true errors.

Probably the most common error to be found in circulation, especially modern coins, would probably be the die crack or slightly off-center (2-5% OC). These would be so insignificant (OC) or small (DC), I doubt they would carry any dollar value, just collector value.

Noah123: I like to think any coin that isn't right is an error coin. I even like machine doubled coins and have made
up six sets of Lincoln Mach Dbld over last 10 years. Of course, I'm odd too. I call doubled dies errors even though
they are varieties instead. I also have a different coin
collector's dictionary, too. My favorite motto is "keep
searching" and you will be holding out stuff that isn't normal
and then you will gain experience and knowledge over time and
see some books and articles and email fellow collectors, watch the forums, then "WAH-LAH!", your lightbulb will light
up and you will tell the difference. Since I am into cents,
to me they only cost a penny and that's cheap! Please stick
with it. My home environment allows me to do this, I am
fortunate. I'm 62, my wife builds quilts in one room, I search pennies in another. Life here at home is great.
Bill S.