How can I evaluate my Parker shotgun

[George Spyridakis]

Hi everybody!
At first I need to apologise for my english since they 're not in good shape...
My name is George and I 'm from Greece.
I found this portal while searching on the internet for information about Parker shotguns and thought that it could be usefull to ask you some things...

So, some years ago, a family friend gave me his father's shotgun as a gift, since he has no children.
It is a 12 Parker double barrel shotgun, made in 1920 (as I found from your site with the help of the serial number). It has two triggers. Under the barrels, there is printed :
PARKER BROS
PAT'D JAN.18, AUG.16.1887
PAT'D OCT.25.1910
PATD. AUG.15.1905

OV

Since I' m not a collector nor a hunter, I don't have any interest on keeping this gun. Searching on the internet, realised that some of these shotguns worth some good money and some other don't.
I will try within the week, to put some photos of the shotgun as I realise that it could' be more usefull than writting a few more things...
But until then, is there anyone who has an idea of what is the value of such a shotgun?
I will take it to someone experienced but since I am unaware of such things, I can't trust him at once...
So, thanks for your time reading this and I will apreciate any answers!
And I' m sorry for any mistakes I might have done...