Hi Yes, Switzerland, Zurich. The flower mark is from Johann Jakob Stähli-Rebmann, from Zürich, in Business from 1886 to 1920. We had the mark already here: viewtopic.php?f=8&t=7669&hilit=Rebmann
I check on DS later when I have access to the books.
Hi I am still not with my books, so the "DS" has to wait. To your question on fineness: Yes, most probably 0.800 silver. When Stähli-Rebmann was in business 13 lot was already phased out. Regards, Jörg