Identificaton help. Again...

Guess so.
Be carefull with the jet thread size.

Its looks a "petromax" style, copy, lantern with a Standard like valve knob.
If it fits they used it...

 

Let's say, the fount somehow missed the marking machine. Or someone in a Petromax or Standard factory deliberately isolated some pieces without markings on purpose.
Could be anything, but how's the built quality on that?

 

@MYN
Quality I would say, in my humble opinion, is at least as good as on my Pmaxes.
/Peter

 

Could be a Petromax prototype model