Since we know nothing about your grandfather and less about the gun any information is purely guess work. How old was your grandfather (mine died in 1938) and when did he obtain the gun? At first glance, the gun appears to be a "Trade Brand Name" shotgun. I have only one listing for the name LIBERTY alone, no LIBERTY ARMS CO. And that gun was made by the Davenport Arms Company and the gun in the photograph was not. The gun in the photograph appears to be nickel plated and highly engraved. "Trade Brand Name" guns were either blued or in a few cases had a color case hardened finish and almost never engraved. The gun in the photograph, I would guess is either Spanish or Italian made. There's a listing in the Blue Book Of Gun Values for the name Liberty, again no Arms and no mention of a single barrel break open breech loader. This name was used on imported guns imported by K.B.I. INC. OF Harrisburg,PA (1997 to 2003). I can make and educated guess as to value. The value of old single barrel break open shotguns depends on their condition, the amount of original finish remaining on the metal and wood as well as the mechanical condition. This gun appears to be in excellent condition and with the nickel finish and engraving, might bring as much as $150 if sold at auction. However, sentimental value can't be calculated. Maybe someone else might have more information.

 

Disassemble the shotgun and inspect the bottom of the barrel and the portion below the barrel that fits into the receiver for proof marks. if there are proof marks, this can determine the country of origin and possible even the date and manufacturer of the gun.

Please post detailed, clear, readable photos of all marks for identification.

 

That's pretty fancy for a single! Nice looking gun.

 

Thank you guys for taking time out of your day to help. I'm not 100% sure on the year he acquired it or the story behind it but if I can find that out I'll let you know. Here are some more pictures.

 

The Spanish proof marks are identifiable, but the photos are insufficiently clear to identify a makers mark or the date of proof code.

 

 

Hope those did the trick

 

I once owned a double gun marked Liberty Arms with similar proof marks as yours. Mine was made in Spain by Zabala aprox. 1966

 

Stamped right there on the barrel is a marking "MADE IN SPAIN"that confirms what I said, the gun was made in Spain A recheck of the entries in the Blue Book disclosed an entry reading Liberty Arms International LLC, an importer located in Albion, New York. There is no breakdown as to just what they import. The book suggests that the company b contacted for information. Their address is:
Liberty Arms International LLC
3808 Oak Orchard Road
Albion, NY 14411
Tel: 565 746 2293
The gun is modern, less than fifty years old so would have to be sold through a Federal Firearms License holder.