100-425 USD
500 USD
New in the box, $500-600 (on a good day) Doesn't really demand much of a premium and if not new IN BOX, not any.
I think you are talking about a shotgun for the National Wildlife Turkey Foundation. With no other information I would be guessing 250-500.
I can not say of the value because mine is priceless, but performance is excellent I use mine to hunt deer mostly, and informal turkey shoots. Patterns great but tried many different choke/cartridge combinations to find what the gun likes best. Highly recommend this gun
Browning.com has sn data under customer service.
500 USD
The National Wild Turkey Federation (NWTF) was founded in 1973 by Tom Rodgers, a dedicated conservationist and turkey hunting enthusiast. The organization is committed to conserving wild turkey populations and preserving their habitats for future generations.
Many companies have made firearms for the NWTF.
Without more specific information; 100-1000 USD
Most go for about 375-450 simply because you can get one from a store for 500. I would recommend asking 475 and accepting as low as 400 if offered.
I have seen it being sold online between $500 and $850. It is worth what ever someone is willing to pay for it. Good luck!