An interesting set of marks to be sure...I see the makers mark belonging to Ferdinand Henzler of Hanau Germany plus a version of a"Heart and Dagger" mark of which I've not seen before, struck twice. The heart and dagger mark was used by numerous makers to represent the town of Hanau. Interestingly, they have been used to overstrike an 800 grade mark plus another mark under the right hand one which I cannot make out. I find the overstrike of the 800 unusual as the item is then marked Sterling. Finally, if you scroll down towards the bottom of the photo you can just make out the word "GERMANY".
Steve:
I can't thank you enough! This is strange mark and really shouldn't be marked "sterling" as that is always American made. I never saw Germany at all - you have f=great eyesight (mine is 84 years old)
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.