I think it's a stag, too, but definitely NOT Swedish; the other marks are all wrong for Sweden. Far more likely is the Lower Silesian city of Jelenia Gora, now part of Poland but in the 19th century part of Prussia (and later the German Empire) and known as Hirschberg; see this link . This is very ...
Berliner Goldschmiede by Wolfgang Scheffler. It's the standard work on Berlin gold- & silversmiths. I do not have a copy myself (it's out of print and monstrously expensive - usually $500 and up) but I keep a running list of things to look up in it and do so whenever I'm near a library that has...