My grandfather passed away last March and he left me an old shotgun that the his father, my great-granfather, got him when he was a boy. I need a little help identifying the manufacturer. On the butt of the stock there is a logo that looks like an H superimposed over an R, and underneath the logo it states Arms Co. Do you think this is a Harrington & Richardson? I looked at the current Harrington and Richardson logo and it is H&R, not an H over an R. I would like to be able to identify this so I can determine how old it is. The serial number is easy to read. There is some script on the side next to the hammer, but it is too worn to read. It is a 16 gauge. Any thoughts on how to determine how old this is?