Hello
You certainly don’t make this easy as your photos are so poorly focused.
That said, I recollect that we’ve seen this mark O.B. twice on these forums previously, on a spoon and on a cruet stand, unfortunately without attribution. The photos have disappeared from the forum.
See
viewtopic.php?f=7&t=37959&p=102881&hili ... rg#p102881
All we can say is that your beaker probably was made in Strasbourg in the first quarter of the 19thC. It has a milled band applied to the rim for decoration, and a personalization in Gothic lettering.
Good luck in your continuing research on this object.
Regards.