My '48 GE "Lococmotive" also had a crack at that common spot on the top near the rivet. The rest of the set was/is perfect. Dont just simply glue the crack/s. Grind a grove in the underside, fill with JB Weld, place mesh over that and put on more Weld. Clamp it and it will be a very strong fix. Mine is practically invisible now from the top.
I agree that these sets look stunning when they are buffed-out and polished. They also work fantastic when properly elec. restored. One of my fav. vintage TV's
Here's mine:
