If the lid is the same material as the pot it should be fine but I can't say for sure as there isn't any info online. This seems to be a Macy's in-house brand and it's no longer available.
The LeCrueset standard knob is oven safe up to a certain temp. They also sell a metal knob that can handle higher temps.
Wrap the knob in foil and give it a try in the oven. If it breaks, you at least have an excuse to go ut and buy a replacement LeCrueset.
"If you want to make an apple pie from scratch, you must first create the universe." -Carl Sagan