It is German 800 standard silver made by Neresheimer & Söhne of Hanau no earlier than 1893 when the company was founded. I cannot help with the value but you might find something similar in Ebay’s “Sold” listings.
The company is still in business with a web site in German here or in English via Google translate here.
Thank you very much for this information. The most important to me was in place of manufacture. The mystery deepens however because my family live in the US and Canada. My grandparents must have bought in on a trip to Germany.
I could not find anything similar on eBay, through an internet search or on their website which is OK, that was less important than the maker and location.