On all these unknown producers, if they do have a punch it is usually blank, that is why they are unknown, the reason for this lack of hallmark could be due to a couple reasons, here is my example for reference, it has a Hallmark indentation but is blank It is from a similar producer (or a later variant of the same production) if you check the book referenced you'll see the similarities :)If we found even 1 or 2 with a hallmark then it might solve the mystery, there are a couple other threads with Obi's St. Sava that can also be used for a reference but so far to my memory none of these has a hallmark (I think Obi's is blank as well, but it would be great if he double checked Here is mine as an example.