Hi rat-tail -
I admire your outstanding photo skills - you send annoying photos but expect clear answers....
Your fiddle back spoons (that´s the name for this form) are from Poland.

Assaymark 1931, probably Warsaw (W) - can´t read the letter on your blurry pic, the 3 stands for 800/1000 silver

Assaymark "lopadka" 1908-15 - can´t read the letter on your blurry pic, could be Ivashkevitsch Kazimir, 84 stands for the old Russian silver content 875/1000 in use until 1920
1918-1920: Third Interim Marks
After Poland’s freedom from Russia, it took a few years for the new Polish government to introduce its own hallmarking system. In the meantime, most silver was marked with the word „SREBRO” (silver), or just „SR” and the fineness still in zolotniki.
RB is the maker (unknown to me).
All a little confusing - but in Poland everything was always different. The spoons are nice and authentic, the silver content is in my opinion 875.
Regards
Zolotnik