Zastava in Serbia currently manufactures them, including the military 'version' M57, the 'updated' M70 in x25 (marketed in the US as a non C&R '57') and 9mm, which has a shortened frame (like the M88 - 9mm compact Tok) etc.
So, those 'added on safeties', quite a few are nicely done because they're added at the factory during re-arsenal. The new made ones, have a safety to meet the 'points' requirement for import. One of the biggest issues for a Zastava Tok is that the civilian hammer pack for slide mounted safeties lacks the half cock, but IRC has de-cocking instead.