The LCM of 21, 43, and 51 is 15351.

The address of the Kansas City Police Historical Society is: Po Box 15351, Kansas City, MO 64106-0351

Hi, the Remington Derringers sell for about $295 to $485.00. You should get-a-hold of this guy he's very fair on value pricing on firearms.
He is: Old Town Station, Ltd.
P.O.Box 15351 Lenexa, KS 66285.
Just send him a couple of pictures along with the info on the firearm and a SASE. He does buy firearms also, but he won't push you into selling if your not into letting it go. Hope this helped a little..
Have a good 1...Silverlighting

Hi, maybe this guy could help...He buys firearms, but also he can give you a fair market value. Company, Old Town Station, Ltd. P.O. Box 15351 Lenexa KS 66285. All you need to do is send him the info of the firearm along with a couple of pictures and a SASE. Good luck! Oh do you know the year? This guy has a couple listed here as: Winchester 1837 $400.00 to $1,200.00 . A 1886 $750.00 to $1,100.00. And a 1895, $650.00 to $895.00. Hope that helped... Chow Silverlighting