Hi -
if the medallion is authentic or not I can not see from a picture - normaly it should be silver. There exist numerous new castings in different materials.
The markings you have never seen before are old Russian (Slaconic) numbers for the dating system, numbers = letters.
In the convention of Slavonic writing numbers were indicated by letters and combinations of letters. This system of writing was in use during the 17th century and continued into the early 18th. With the reforms of Peter I, Arabic numerals were introduced alongside it.
Apart from the system of writing there is a further problem with dates, the problem of chronology. Old Russian chronology begins with the first of September 5509 B.C.,the presumed date of the Creation. The chronology of the present day day must thus be calculated by deducting the Old year number 5509 (or 5508, according to the month of the year). Besides that it was usual not to indicate the thousands in the old date so that one must add the figure 7.
Example:
CS = 206 plus initial number 7 for the 000s
7206
less 5509
_____
1697 (up to 31 August; 1698 from 1 September
Much fun deciphering it!
Regards
Postnikov