The plane looks like a copy of a Stanley No 78.
As far as I have found out on the Internet, the company Ståhls was a large retailer that branded tools made by other companies. Therefore the plane is most likely manufactured by Järnbolaget Eskilstuna (Sweden).
A couple of things on this plane are peculiar:
There are both inch based threads and metric threads present on the plane. And it doesn't look like the metric threads have been added later on as a repair job.
The screws for holding the iron and the lever cap look a lot like 3/16" threads, but the thread for the rod holding the fence and also the screw to tighten the lever cap are M6. The thumb screws are both M5 and the screw for holding the nicker is M4.
The best suggestion I have as to why the manufacturer didn't stick to either imperial or metric threads, is that the setup for the drilling and tapping of the two diagonally placed holes were a dedicated machine that was difficult to change, hence they continued with the imperial threads in those places. The rest of the holes are all square to the cast and ground body, so they could be made on any drill press. But this is just my guess.
The spelling of Sweden is wrong.
Apparently they must have decided that the function of the plane was more important than any misspelling, so they finished the run of planes.
Now this is the only plane that I have from Ståhls, so I don't know if this is a mistake that is on all their planes, but I doubt it.
The misspelling must have started out somewhere, perhaps it was drawn correctly on the drawing that was sent to the
Whatever the reason, the spelling is as you can see SVEDEN.
I think that whenever I will use the plane, I will always know that whatever mistake I make in the project, It will be easier to conceal than a misspelling in cast iron. That is a comfort.
I cleaned the plane and checked the sole for flatness. It was dead flat. The fence was square to the sole and also flat. The only thing that was a bit out of square was the depth stop. I fixed that with a file and some emery paper. After that I honed the blade and cleaned the plane a bit.
I filed the knicker at the same time, so it didn't protrude quite as far.
The only part missing was the thumbscrew for the depth stop. I made a new one out of brass on the lathe followed by a bit of sawing with a hacksaw and some filing.
Note the spelling: MADE IN SVEDEN
Plane before cleaning.
Ståhls moving fillister.