Gun ID

Last Monday my grandfathers home caught on fire. Unfortunately, he was not able to escape and lost his life. We are now left to sift through the rubble of what very little remains. He had quite a few (very old) shotguns and handguns. I’m needing some help identifying this 1 in particular. I appreciate any and all input. If better or different pictures are needed to help identify, please let me know. Thank you!!