OOF Czechoslovakia marks on glass

Please note, image copyright Stan Weitman.

This mark seems to have been identified.

"The company assets were sold, all hints pointing towards a company owned by Otto Friedlander who later owned a small import business located on 5th Avenue. Not a problem, I thought, as that somehow matched the 'O.O.F.' marks.
However, Albert D. Donnenberg contacted me in July 2013, stating that his grandfather (commercial photographer David Aronow) had a client named Friedlander which in 1939 gave Albert's mother a present: a bust of Beethoven, marked 'F.B.S. Czechoslovakia'. That would not be spectacular, however Mr. Donnenberg also mentioned that 'F.B.S.' stood for Friedlander Buying Service, a name which can indeed be found in the 1940 and 1946 Manhattan telephone register. But:
pre-1931 telephone/business registers list 'O. Friedlander, imports' or 'Friedlander & Co., imports'
pre-1931 telephone/business registers DO NOT list a Friedlander Buying Service
the 'F.B.S. Czecho-Slovakia' marks were used between 1918 and 1921, a time in which this Friedlander Buying Service did not exist
identified suppliers show numerous orders and invoices for both Ferdinand Bing & Co. and Ferdinand Bing & Co. Successors
same suppliers have nothing on O. Friedlander or Friedlander Buying Service before 1931
So far I could find, the Czechoslovakian factory of Fischer & Mieg (Pirkenhammer) in March 1937 actually invoiced a batch tea sets to Friedlander Buying Service. The ten sets covered by that invoice (each consisting of a lidded tea pot, lidded sugar, creamer, six cups and saucers, and tray) were all additionally custom-marked with 'O.O.F. Czechoslovakia'.
It therefore appears that Friedlander simply adapted his company name towards the 'F.B.S.' abbreviation as he probably still had a large stock of 'F.B.S.' marked items left over from before the purchase. Only later on did he use an 'O.O.F.' mark similar to the former 'F.B.S.' marks."

cordially,

Marcus