I have got German teaspoons (see photo and another with marks).


From the left and right marks I gather that they were made by a Herman Julius Wilm in Berlin(?), and it is 750/1000 silver.
Since there are no crown/crescent marks, they were most probably produced before 1886/1888. What I do not know is the middle mark.
Is it a date letter? Or another mark of the maker? Or town mark?
I have also a more general question, as the old German silver proof is usually given in loth (750 = 12 loth). When did they start to use thousands measure?
Any help will be greatly appreciated.
Kind regards,
Georg