Recently a lot of fake silver marks appeared on the market. One of them has been reported in Members' Window # 45 by Mr. Willand Ringborg.
He claims that the mark shown below is a fake.
I have evidences that contradict Mr. Ringborg conclusion.

In the images shown below you may see six goblets and basket bought by friend in USSR in official government run shops in 70's (in Krasnodar, then USSR, today Russia).
They bear marks exactly as that on the previous image.
Moreover, the goblets were brought to Poland and checked by Polish officials who re-marked them (see image below). These two facts suggest that the suspicious mark is not a fake.

All the items were produced in 1969 in Dagestan (USSR), therefore I think that these marks were used in this period.

Gilded Niello Goblet (set of 6) and basket
Kubachy, Dagestan, USSR
references: M.M Postnikova-Losseva, N.G. Platonova, B.L. Ulianova "L’orfevrerie et la bijouterie au XV-XXss." (Territoire de l’URSS), pp. 23, 263 N-3952 , 308 N-6262
Marks:
1. Star+875
2. manufacturer 9KXK: 9 for 1969 and the KXK for
"Kubachensky Khudozestwenny Kombinat" (Kubachy Artistic Handicraft Factory)

Goblet double-marked with original Russian mark and Polish re-mark

Manufacturer 9KXK: 9 for 1969 and the KXK for Kubachensky Khudozestwenny Kombinat" (Kubachy Artistic Handicraft Factory)