Hate to be the bearer of bad news, but it really isn't worth much. It might be worth about $100 if you can get someone to buy it (i.e. someone who like old cameras, etc). There were a ton of Zeis Ikons back in the day. They were an affordable SLR (actually what's called a rangefinder) camera and such were picked up by everyone. Even in the mid 90's I could find one every weekend at a garage sale for less than $40. The lenses don't mount up to anything current without an adapter. Also, condition really depends on how the camera was stored. The metal might look good, but it's the glass that is important. It can be quite easy for these older camera to get a type of fungus on the lens which kills price (and their ability to take picture) but you'd never know it unless you look closely.
If you want cash, put it up on ebay and cross your fingers. Sometimes they can go for upwards of $200, but it all depends on who's looking at that moment.
Just to check, how many lenses are with it? Depending on the lenses, I might have to eat my words (with the right lens, it's worth more than the camera).