Hey guys, just an update. I was at my Poppop's today and got a pic of the revolver. I only had my phone, so its just the whole gun and the serial number, no stamps. On top of the gun behind the front sight is stamped "HARRINGTON & RICHARDSON ARMS CO.
WORCESTER, MASSACHUSETTS. U.S.A
On the side of the barrel is stamped H. & R. "AUTOMATIC"
And on the butt is the serial number 512574