Stamp Identificaton - Please Help!

Found this riddle in a German stamp board - unsolved for 13 years.
I tried my best, but gave up already.

Maybe someone knows this stamp?
And sorry for the low picture quality.

Tommtomm...

Interesting. Thanks for sharing. This is a new one to me.

Can you tell us more about what is written across the sky? Is it letters? Symbols?

In my opinion either letters with dots (B.K.S.) or some kind of word "Be-Ko-So", "Ba-Ko-So" ...

There is a BKS bank in Austria.Name evolved over the years.
Bank für Kärnten und Steiermark.The Reichsmark (RM) was used in Austria from 1938-1945.
https://de.wikipedia.org/wiki/BKS_Bank
???

A bank in Austria?

Well, I think I should have stumbled upon this stamp in the past ... I am from Austria.

We've only had "RM" as currency in the time of German occupation, but only on German stamps, and such a building has never been built here. Definitely no track to follow ...

Perf12...

Well done. Agree with RM as Reichmark.

Could be some sort of savings book stamp.

The stamp was found! A German user solved the riddle, but it's been quite a challenge.
And I'm very happy, that it was no Austrian stamp ;-)

The stamp was issued in 1942 in Berlin, so Reichsmark is correct!, by the Belarusian Comittee for self-help "B.K.S." in Berlin (sorry for the translation).
It was used to pay membership fees or for donations, and shows the castle of Vilnius (Belarus). They had issues in red and green as well.

http://kamunikat.org/bek/marki.html#did14

Tommtomm.

Thanks for sharing the results of your research.

Can you tell us anything about the "book" of stamps shown in your posting? Is it a catalogue? And if so, the name?

Thank you.

What an interesting label! Thanks for sharing it.

I would never have guessed what it was.

I know the story of the Polish occupation of Vilnius as the "Republic of Central Lithuania" but I've not seen anything like this reflecting a Belarusian claim.

Here's a view of the castle today from Wikipedia:

Well, the website is from the Belarus Institute of Science and Art, and it seem's that they have put together stamps and cinderellas connected with Belarus. They mention a Swiss catalog edited by

(sorry, the board doesn't like cyrillic letters)
as starting point for their online presentation.

Maybe a Russian speaking user could help, because the google translation of the website leaves quite some questions.

Hi Tommtomm,

I wonder if that reflects a misreading of the name of the Swiss catalogue publisher Zumstein as "Zustein"?

Nigel.

Anything's possible.

As you are indoubtedly aware, quite a difference btwn the (original) Cyrillic and the work "Zumstein".

The mystery continues.

I assume a M is missing

I think they meant Zumstein, who published an Europe catalog in Switzerland.
I didn't know this name so far, but it's a quite possible explanation.