hi, welcome to the GMB

Believe Violetta is Polish, and currently being made? - not too sure though. Perhaps someone from Poland can comment on this.
Certainly wouldn't think you'd burn a candle underneath - would go black quickly I'd think.
The shape of the glass is very similar to the glass shades that were used in the earlier part of the C20 on table or wall lights - only I think then they were used the other way up, and there was ventilation for obvious reasons. The period shades had collared recesses to accommodate screws which held the bulb holder to the glass.
I'm wondering if the brass holder and glass do actually match.??
Would agree it's unusual, some obscure form of wasp trap maybe