This is a beautiful Baltic Amber necklace. I have found two others online that are nearly identical. Theirs are marked 875, relating to the silver content (a bit less than Sterling silver). I do not find that on this example, but it definitely is silver. I do see a mark in the Russian Cyrillic alphabet which equates to B (looks like an S from our alphabet), a backwards-looking R ("ja," "ya," or "ia" in Russian), and K, which is also a K in our alphabet.
One of the other examples bears a sickle and hammer mark that dated it to around the 1950s although that mark reportedly continued to be used into the 1980s. This piece has the look of an earlier date -- certainly at least the 1950s. It is clearly hand wrought (based on the appearance of the bead caps. The spring ring clasp is gold filled and is almost certainly a replacement. The jump ring to the clasp may also be a later replacement.
The necklace is lovely. It measures 19" in wearable length. There are 9 graduated beads -- the largest at the center and becoming smaller on either side. The length of that central design is 8 3/8". The beads are a gorgeous honey color and are quite uniform in shade.
This piece is from my own collection and I wore it proudly several times. It is truly nice quality and beautiful!