Zeiss Ikon Microscope set

OK, I got this set a few days ago. I didn't know what it was exactly at first but I figured it out quickly that this is a set to take photographs with a Microscope. It's a set that works with glass plates (size is 6.5x9cm) and the whole thing has a shutter too. It works quite nicely. Unfortunately there seems to be little info on the web about these, most ebay auctions are just (newer) parts and not sets with the box and stuff. I have no use for it so I would rather sell/trade it off to someone who is really interested in items like this, anybody has an idea about value of a set like this?? all that came with it is shown on the photograph.