I have a variety of weapons... but I do not own any antique (older than 1900) ball revolvers. Such as the 1859,1860 or 1862. I would like to purchase one or more, but have found that there are numerous Colts and other brands that have been reproduced. What type of things do I need to check to authenticate this type of revolver? I have spoke with a few people on the ODT, but the more information the better. Thanks in advance.....