Sold one of mine 6-7 years ago, also in very good condition, for around $450 IIRC, but did not have the volley sites. I also have one very similar to your description, wouldn't think of selling mine now for less than somewhere in the $750-$800 range (and I may be too low at that!) Pictures of yours would help, but based on your description, I would start high and see what offers you get. That is based on the market were I live, money could be higher or lower based on the actual condition. Have to remember; these rifles are getting harder & harder to find, especially with volley sights intact!

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