I have cropped and embedded images of marks on amber pendant.
Members of this forum will benevolently answer your question, but please, next time embed your images.
The mark on the left is Soviet (USSR) mark for .875 silver fineness and letter R (in Cyrillic) for Riga assay office.
The maker`s mark ЯК 4 stands for Калининградский янтарный завод (Kaliningrad Amber Factory).
It was made in 1964 based on the digit ``4`` after letters ЯК.