Your set is by the German firm of Wurttemergische Metallwarenfabrick ( WMF).
In 1880 a merger of two companies formed the firm of WMF.
This new company became famous for its high quality of plated silver produced by a unique electroplating (EP) process.
Its items are still much sought after today, especially its Art Nouveau ones.
The 1/0 stands for normal electroplating standard used.
The OX stands for oxidized - a process by which parts are shaded for definition.
Your set is not Art Nouveau but mid-late20thC.
My research indicates your WMF plated silver tea set has a retail vintage store value of $600-650 assuming good condition.
A private seller to a dealer or at auction can expect 30-60% of retail value.
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