I thank you very much for your help and the other informations. I did not know, that up to 4 times the same mark on one object is done in several places in Denmark.
Bernt Zeitzschel wrote in his book (about the gold- and silver-marks of eastern Schleswig-Holstein), that the doubling of the makers mark probably should imitate the "normal case" of silver-marking of bigger cities where two marks, a makers mark and a city mark, were usually common.
In this context it is interesting, that you wrote, that in Denmark up to 4 times the same makers mark was used. I have no experience with danish silver, but in TARDY I just read, that the silver before the act of 5th April 1888 regularly bears 3 marks (city mark, sign of zodiac and assayers mark). Added with the makers mark this are also 4 marks.
So the reason for the multiple makers marks is probably really the imitation of the "normal case" of marking with its regularly numbers of marks. But probably I am wrong.
Tanks and kind regards,