I put this in the wrong category ~ should have been in percussion pistols!

 

Hard question to answer without more details. I have two used Centaure's for which I paid about $300 each. I think one was $285 and the other was $325. The last new in box one I saw sold for about $600. Centaure's are not common but there also aren't a ton of people collecting them. I have seen people asking rediculous prices, like $900 for beat up ones but I highly doubt they sell at those prices. However, there are some rare variations for which die-hard collectors might pay a lot. You should go to this website 1960NMA.org and try to determine which variation you have. At the top of the page there is a link to "Forums" which you should join and certainly someone will be able to tell you which variation you have and might be able to give you a better idea of what it's worth.