The gun has 65 stamped on the trigger gaurd, on the forearm metal, and penciled on the gun stock between the two screws that attach the trigger gaurd to the stock, so 65 must be the serial number as well as the chamber length.

The pad is a Jostam Hy-Gun (I think I mistakenly said Hy-bird in my above post)with a patent date of Sep, 20th, 1927.

I can't make the oval out clearly as only the bottom half came out when it was stamped. I know the first letter is M then it looks like the symbol & followed by what looks like P, so tt would be an oval with M&P in it.