Interesting! It just looks like a 45/60w CPOTW lamp with a different base!

I've not seen any CPO arc tubes like this with an asymmetric construction?

More the outer glass i was referring to. Looks like a CMH tube inside a philips CPO jacket

Full screen and zoom in if you are on a phone. It's weird lol. GE have always used smaller outers on their lower wattage G12 halide lamps AFAIK.

looks like a hybrid, like a combination of two sealing methods

The sealing method is the same at both ends : a standard frit seal to niobium-zirconium wire plus inner molybdenum coil. The ceramic arctube is unusual though and unique to GE. Forming the latest ellipsoidal shape arc tubes is extremely expensive. The most advanced are the single piece ellipsoidal type as used by Sylvania and a growing number of Philips types but these are also the most expensive. A cheaper method is the Osram Powerball style, also copied by Philips, having an ellipsoidal shape made from two pieces of ceramic sintered together around the centre point. GE’s design here is cheaper again and actually slightly better. It is still a 2-part ceramic but the interface is shifted off-centre to one side. This makes assembly very much easier and cheaper, and being asymmetric has the advantage that when used base up the thermal profile is actually better than an ellipsoidal arc tube, and performance can be slightly improved.

Interesting. My terminology was wrong but I suppose you know what I meant.