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My smart-***ed reply would be about $100 / inch.
But anywhere from $750 to $1250 would be the range I'd put it in. Depends on a lot of things, like your location (there are regional price differences), more importantly what you have with it (original case or box, tools, paper work), and most importantly, the buyer- how bad do they want it?
Hopefully you have the rear sight. If not you should probably get one, even if you don't install it right away that's a $100 deduction on value. Sight assemblies run about $60.
You can do a search of completed auctions on gunbroker if you're registered with that site, and you may find what similar guns have sold for recently if you're lucky. Hard to do with more unusual firearms, however. You can also do a google search on this forum using the search option on the masthead.
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