Featured What is this mark on brooch clasp

Hello all.
I purchased this what I was told amber leaf brooch.
On looking further I saw these numbers and letters.
Would anyone know what it could mean??
It look like the number 6 with a letter R which is backwards and a k. All in a box on the clasp . I sent photo but appreciate hard to see. Any help would be greatly appreciated .

 

sorry there is no reply ....
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Brilliant . I got it now . Fantastic what a great help . Many thanks
Xxxx

 

Thanks it's fine.
Someone has already kindly informed me. And very quick too.
very knowledgeable here.
Thanks all

 

We've seen a few of these.

 

Yes , amber . And very pretty too.
Xx

 

whom...?

 

Given that the "R" looks backwards, I wonder if the the mark is Cyrillic.

 

It's a Russian or at least Baltic pin, so no surprises there.

 

Kaliningrad Amber Combine.
ЯК- Янтарный комбинат.
Amber- Янтарь
Combine- Комбинат.

 

It is pressed amber, so real Baltic amber that is heated and pressed into a shape. They also actually melt the amber, which gets a better result.

 

Thank you
Xx