When you say "white gas", what do you mean? Do you mean petrol/gasoline or kerosene/paraffin? By the looks of it, it is a kerosene lantern. Nice lantern by the way. There are several companies with a 100cp lantern in this design. I wonder which one came first? My guess is the Petromax 900.
Definitely a Kerosene lamp. If anyone knows a source of Petromax 900 jets I would like to know as well.
You can use new jets and needles from Petromax 150 hk. But if you anly want to light with NOS parts, then you have to look around