Here is my oldest Petromax lantern, a Petromax 826 from round abaut 1930. It still has the old, one-piece carburetor with the service screw below the carburetor tube. Unfortunately, I couldn't see any markings on the bottom of the tank. Based on various catalogs, I assume that it was produced between 1928 and 1931. Petromax 826
It does appears so. You have a very desirable lantern. Looks complete with all the original parts too.
Congratulations @leo . I wonder if your lamp has "regular" mixing tube or maybe something like that below? all the best, Piotrek
@leo Very nice old Petromax and even with a pressure gauge Does it also have this inner case screwed into the hood like @Piotrek showed ?
I would have thought that both should be screwed together. At least it is so at my lanterns from that age.