That is a well documented model. It's called the M48bo. The "bo" stands for "bez oznake" translating as "unmarked" or "without markings." These rifles were "sanitized" for export. Many for those numerous "liberation front" type organizations so common in the '70s. It was kind of silly considering the Yugos were the only ones making that type of rifle at the time.A new Yugo M48 with NO crest.
Interesting. Are you sure it is a M48.?
Do you have pictures of the receiver by chance?