The last thing Bulgarians would have wanted (especially around that time) was to promote KGB. And the sinister three-letter agency in question would not want that either, at any given time, unless they wanted to give it to someone as a gift (for good service, etc.), which is unlikely. But in that case the grips would have come from another / Russian PM. The engraving is good quality though.Somebody with a laser engraving machine and too much time on their hands?
WHY would the KGB want to use 1989-built BULGARIANS?
As I recall, they had a lot of trouble at about that time (1989) with their country falling apart around their ears. Enough trouble for them to not have the time to worry about 'presentation grips'.