In another post, you say you have a 41cv. Do you have both for sale, a 41c and a 41cv?
All the info you can give will only help—serial numbers, close-up pictures including of the displays and battery compartments, etc.. Are you selling any modules or accessories with them? Even if you don't have or want an eBay account, you can go there to see what these are going for, and come up with an asking price, being flexible of course. If more than one person responds, all the better for you.