It's worth $1, and I'll happily take it off your hands. Next question!!!
Seriously though, with no details or pics or anything other than "it's a Model 99" it could be worth $150 or it could be worth thousands. As for the best way to sell it, the same way you'd sell any other gun: local dealer, gun show, forum classifieds, GunBroker.com, Armslist.com, etc.
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