Please Help identification of hallmarks on silver beard comb

Update on # [Hallmarks on a silver foldable comb] (Hallmarks on a silver foldable comb)

I’m completely new to the intriguing world of silver hallmarks.
I was thrilled to find another exceedingly small hallmark on the comb.
These are the two hallmarks I already mentioned

Today I discovered a third hallmark when cleaning the comb:

It looks like there are two letters A or R followed by a K in a hexagon.

I hope that someone could help me identify these marks. Thanks.