
Those three rings at the top are identical except for the hallmarks. All have 2J ?, 3 (hammer and sicle inside a five-pointed star), and 916. But one has number 2, other 23 and last 33. What do those numbers mean?



Then the last one, picture is a bit poor. I think the hallmarks are 9C10 and c (hammer and sicle inside a five-pointed star), 875.

Much appreciated if someone could interpret these.