Buying Errors

It really depends on what error coins you are looking at and actually also what countries the error coins are from. Some countries have actually higher minting standards. For example an average Mexican error coin wouldn't be as rare as let's say, Korean error coins. There is a big difference in the prices.

As well as, error coins in general should increase in value over time as most error coins are unique.

When speaking of errors and pricing, it's not a good idea to include die varieties into that mix. Doubled dies and repunched mintmarks follow a completely separate market than errors - yet another reason why I am so adimate in pronouncing every chance I get that die varieties and errors are two separate things. They have a separate collector base, a separate knowledge base, and are not mixable to the specialists of such things.

Errors and pricing - probably just about as scattered as the examples of errors in the first place, but rarity is among the top players in their value. That alone not being enough, the ease in which a lay person can tell there's an error present is another. In other words, whether or not the error is obvious.

Those two things together usually generate a value for errors. The obvious ones that are common are worth much less, as are the scarcer ones that take a specialist to point out. Combine the two criterion and you end up with a valuable error.

Generally those with value will also not fit into a normal roll of coins. Laminations, die cracks, clips, rotated dies, and other coins that otherwise fit into a slot made for that denomination are probably naturally more common because they usually were never caught and made it into the bags for circulation. It's the caps, bonded pairs, and severe broadstrikes that are generally worth far more.

Note that I said 'generally' there.