Interarms imported most of these in the 1960s. Some were sold with the Bulgarian crest on the toggle intact, others had the crest remove to obscure the fact that the guns came from a (then) communist country.
A small number (about 1000 - 2000) were sold to Erma in Germany, who renovated them and sold them onto the European market.
Hard to judge from the photos, but this may actually be one of those Erma reworks.
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