Russian/Soviet Cloisonne Egg

[stil0041]

I am trying to learn more about this Cloisonne Egg I acquired more than a decade ago. Any help on identification of the hallmark, approximate age, etc. are greatly appreciated.

(I apologize for being unable to figure out how to directly embed images into the post.)

https://i.imgur.com/QU5pYKB.jpg

https://i.imgur.com/8BTtNnf.jpg

https://i.imgur.com/el44jeq.jpg

[Qrt.S]

What if you read the first thread:
http://www.925-1000.com/forum/viewtopic.php?f=1&t=10
Anyway, this Soviet egg is made in 1983 in Leningrad in a factory called "Русские самоцметы" (Russian gems)

[stil0041]

I am trying to learn more about this Cloisonne Egg I acquired more than a decade ago. Any help on identification of the hallmark, approximate age, etc. are greatly appreciated.