I picked up a Minox spy camera at a yard sale and would like someone to give me some information about it. On the back at the top under the Minox and Wetzlar printing it has a III. I opened it and it has no film, but in the film loading area on the top is a serial 91 344. On the top it has a black nipple that fits up into a hole on the top. (flash connecter?) It also has a smaller unit, what I think is a stand alone light meter, cases for both and is all attached with chain. What would this sell for?