The silversmiths firm Wilhelm Binder were founded in
Schwäbisch Gmünd, Germany in 1869.
Conclusion: Looking from left to right.
1) The Half Moon and Crown symbol is the sign for made in
Germany after 1884, and was compulsory
2) 800 means the standard of silver is 800/1000
3) The letters WTB are the letters that symbolize the
firm Wilhelm Binder.
This is a hallmark of a piece of 800/1000
silver, made in Germany after 1884, by the silversmith firm
Wilhelm Binder in Schwäbisch Gmünd.