Parker Double Barrel, 1881, Laminated, Need Info, Please.

[Tim Overcast]

Hello, my name is Tim and I have acquired an old Parker. I have ran the serial number, 20442, and found that it was made in 1881. I have also looked for the other information such as frame size, etc., but I can not the markings. The only markings other than the serial number is the number 13 on the barrels and the initials JM, there are also what appears to be two swords crossed over a shield stamped on the barrels and the water table. I am trying to figure the value for insurance purposes and if I should invest in restoration. I will attach photos and will try to get photos of the markings also. Any information would be appreciated, have a great day.