Fordochka, and you know who was the former owner? How it came to painting? In short, there's somebody you have to move in your investigation? Or only the blurred stamp? By the way, you can take a picture and show it large? Maybe, who knows.
If you have nothing except the stamp, then send all the efforts to recover it. I think that the picture was written before the war, or perhaps in the war, or immediately thereafter, and the date - the result of some inventory, no more. But to understand where this one was ...
And as for the word "special" (and gentlemen, get ready for a stoning!) I think so: too large and too tightly, it is written in red ink, to be something trivial, like the dining room or cinema. (To lazy to throw stones, you may find this statement a product of excessive imagination.)
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