Hmmmm. It says Humugo on my base AND made in China.
Just ot recap -
Giant/Mega - 250oz black base USA made
Grande - 250oz silver base China made
Humongo - 10 Gallon USA Made
Colossus - 10 Gallon China Made
Congratulations on the Humungo! If I remember right, some late Humungo's had the base made in China but still were filled in Chicago with German made globes. I might be wrong on that though.
As far as the bulb, do you mean that the 250 watt bulb exploded? Maybe just a bad bulb as several members here use 250 watt bulb on their Humungo/Colossus lamps. You might have to set the dimmer below max though. I wouldn't worry about the coil unless it proves to be a real problem. The bigger globes aren't the easiest to open and re-seal, plus the wax has to be melted to get the coil out. If you do decide to redo the coil you should be able to just untwist it and reuse it.
Finally, opening a new discussion would be easier for you to track responses