I recently picked up this Gillette Razor at a antique store. From the research I've done it looks like a 1906 Single Ring with the serial number 419632. The only thing I don't understand is the Pat Nov 15 04 on the bottom. It is really hard to read and looks like there is something else scribed with it. I tried doing research, but can't find anything like it. Below are pictures of the razor and case to help identify if this is in fact a 1906 Single Ring. Any help would be greatly appreciated.