I see the mark of M.H Wilkens and Son of Bremen, Germany with an 800 parts per 1000 silver fineness mark. I would expect to see the German standard post 1886 mark of a crescent moon beside a crown. Can you confirm if it is also present?
Style wise, I would place it 20th century, possibly late 1st quarter or early 2nd but this is just a personal opinion so wait and see what others have to say...
I think it is Wilkens Bremen though without halfmoon and crown, because the pattern has No. 188 in the Wilkens catalogue. With regard to the number I date the design before WW I, but that is not sure because Wilkens did not give all the pattern numbers chronologically. The production must have been made after WW I, because at that time half moon and crown no longer was compulsory.
Regards silverfan