Hello, this is one of many variants of the Bruckmann eagle, compare here
https://www.925-1000.com/Fgerman_marks_a1884_2.html
The pattern was in production pretty much from beginning to end of the company. I tend to believe that the eagle in a circle was used until the early 1920ies only, just a gut feeling though. As the piece shown here has German hallmarks introduced in 1884/1886 this gives a very rough time frame. Regards, Bahner