Hi,
Yep. A PAR-36 bulb. Parabolic Anodized Reflector. They are spec'd by 1/8 of an inch. In this case 36 x 1/8 of an inch.
It's a Spot Lens, so not like the old PAR headlights (which were larger and, even larger, depending on 4- or 2- bulb headlight designs) where you see a lot of little lenses in that front glass. Flood patterns and Trapezoidal patterns. Spots are smooth.
The TS is the brand. Tung Sol. Also lots of GE and Westinghouse and Sylvania ones out there, too.
Have fun.
Oh, and pay attention to voltage here. Lots of these Beacon Rays were 6 volt as well as 12 volts. Plus some 24 volt ones here and there, but they are far fewer and further between.
I know that the original tag says 12 volt, but these have a way of having been converted over in both directions. I once modded a 12v Hill Light to 6v for use on a 1950 Ford.
Stan