As I have reiterated in many of my responses to your questions, it is important to educate yourself first. Here is a website on doubled dies:
http://doubleddie.com/58222.htmlIf you blunder into the hobby blindly, you'll be taken advantage of. I can grab a hammer and a couple of coins, then crank out "error" coins that exhibit ridiculous amounts of doubling. However, it would be incuse, and not raised, which is a glaring error. Many beginners would likely fall for this, but few of the people here would. A few minutes of research and the most basic understanding of how coins are made will help you catch stuff like this.
A quote oft attributed to P.T. Barnum (erroneously so) is "A sucker is born every minute." I've seen coins on
ebay listed as error coins when it's obvious someone just took a file to the edge. $250 for an
IHC worth less than a buck? No thanks. (Not sure what
IHC means? Look it up!)
This hobby is complex, and there's a lot of learning involved. I'll liken it to baking: before you can bake a cake, you need to learn what an egg looks like.