the sugar tongs have arrived and I could inspect them closer.
The assay master is Victor Savinsky, 1859-1894 on duty.
So the maker must be someone who worked with niello and is known for his quality, someone who worked within the term of the assay master.
Here better photos of the marks:
My educated guess is: Rukawischnikov Wasilij E. 1890-1908
Some other objects from him: