Sylvania 130v 500w Mogul

Here's a unknown incandescent lamp that came with my Powerlite gumball, surprisingly it still works too. It's shown lit up in my R47 which I bypassed the ballast briefly for testing.

I don't know who made this or the exact wattage/date but when I tested it, I found that it drew around 3.47A and 416 watts. Some design features I've are that, it has a heat deflector disk, the glass insulator on the base is black and taped. The etch was mostly faded, all I could make out was a W, there's a pic of it here:



EDIT: Thanks to Dave for the info.