Don't think so. If it doesn't have teh Petromax markings. What lamps are you collecting ? How long are you collecting lamps?
@Nils Stephenson , or a no name with a E&G wick knob. If the lamp body and top disc don't have the embossed markings it ain't a Petromax (for me). But it looks like a Petromax style 834 or 835.
1st: 2nd: I am getting old and my eyes are too not getting better but I see differences, to the point that I would say: they are not the same. So want is the relation between the two reflectors and the lamp shown?