VERY Strange Yugo M57 Tokarev pistol I just acquired -see link to pictures

[boxermachine]

My 1st post here. The frame was not modified, it was made with the arch in it, has a serrated trigger guard, modified trigger and hammer and a big beavertail. Any guess as to who this was made for? Has the Yugo crest and #'s match. So strange, I couldn't pass it up.
See pic's here:
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