I think it's a blowlamp. You light it and blow in the pipe to create a usable flame.
My mate, apprentice plumber, made one in his first year many years ago.
^ding ding ding^ we have a winner.
it's a mouthblown jewellers torch (blowlamp)
haven't heard of togas before, but leave it with me, I'll ask those in the know.
They do tend to make you feel rather lightheaded, the combination of interfering with your breathing pattern and causing you to gasp in fumes between blows.