Here's yet another version of the FBS mark, this time on a 1930s opalescent glass vase by S. Reich & Co.
The vase is shown in Reich's 1934 catalogue as no. 8930 (Thanks to Seigmar Geiselberger of Pressglas-korrespondenz.de for the catalogue ref.).
The mark on this vase is silver in colour and has the usual FBS in the centre, surrounded by "CZECHO SLOVAKIA".
Steven