Value of a 12G single barrel Harrington & Richardson shotgun

Question
I am trying to research the value of 12 Gauge choke single barrel Harrington %26 Richardson shotgun that has a manufactured date of Feb 27, 1900. I am researching this for my father in law who is dieing of cancer. So any information would be greatly appreciated. Thank you!

Answer
I am sorry to hear of your father in-law's sickness. I lost my grandfather to cancer back in 1995. On to his gun, H&R guns from the 1900-1901 range only fetch $75 to $150 bucks, depending on the condition. The sentimental value will by far make the gun worth more then that to your own self and collection.  

 Chris