Moderators please excuse me for dragging the thread in non-Yak direction, but anyway the Yak discussion was an old one
The guys are helpful, gave information about the 17 - this one is Soviet. And there are at least 3 examples of lim-5 preserved in the country - one in the same Aviation museum, one at the entrance of the Besmer af base and one in Bresovo /it is on the photo here:/
http://pic.bgspotters.net/?id=5961