Question Unknown markings on AKM-bayo..

Hi collegues.
Got some interesting AKM bayo - interesting because of markings on crossguard (not because of barrel ring removed).. Has anybody seen such kind of markings in this type of AKM?
For me those markings seems pretty similar to markings on SVT40-type soviet bayos - but I´ve not seen them on soviet AKM-bayos before.. Is this AKM bayo sovietrussian at all? If not - to which country it may belong?


Click to enlarge the picture


 


 


 


 


 


 

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