Nickel Plated

I have a Colt Python 6in 357 nickel plated made in 1973 according to the serial number. What is it worth?
Here is a page of Pythons. Note the prices vary from about $600 to well over two grand. Also note that no one is bidding on any of the guns.
http://www.auctionarms.com/search/auctions.aspx
I buy and sell on this site quite a bit. What I have noticed about Pythons is the longer barreled guns generally bring less than the shorter 4 inch ones and the 2 1/2 inch brings the highest price. I see guns like yours sell for about $1,000.
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