Just a quick check of the previous auctions, looks like you could get $600-$700 maybe $750 if the right nut is looking. If I was looking for your gun, I personally would keep looking if I found it for $700. But 3 sold for more than that in the last 90 days on GB. If you thought you wanted $700 for it, put it on the GB with a $700 reserve, worst that could happen would be some people on this sight will say you REALLY like your Redhawk.
Like Contender said if you have the box and papers, it makes it more appealing to the crowd that buys these guns that are more rare.
At any rate, nice gun. I wish it was higher on my list of wants..
edit.. Before I offend someone, when i said "nut" I was including myself in that group.