Well I think I have found the exact age of the gun. I was able to locate a proof mark dating sheet for Belgian damascus barrels. Based on the proof marks on my gun it is 1924. There are several proof marks that ran 1924 to present but only a couple on the barrel that were used until exactly 1924.

Knowing the age of the gun is there anyone that would know, roughly, the value of this gun? If it is valuable I will give it back to my father. Thanks for the help.