Yes, you should describe it it as being German and from Hanau. Looking through the right hand heart and dagger mark, I now believe that the mark underneath is the standard German crescent and crown as would be expected. I looked online and found two pieces, a candelabra and a goblet. The first having the maker mark, heart and dagger and a 13 loth mark while the latter the crescent and crown, 800 and makers mark. Yours has a combination of both plus the additional "Sterling" which I suspect was added for the market in which the item was sold, It would be interesting to have your piece XRF tested to see what grade of silver it is actually made from.