The Mod 98 and M48 are two different actions, the Mod 98 you got is full size standard issue German made Mauser action, the actual maker/year will be rather difficult to figure out. The M48 is known as an intermediate action, while both are large ring 3 lug actions, they share nothing in common other than the 8mm round. The M98/48 name is just Yugoslavia’s name to separate it from the others, there is also a Yugoslavian M24/52c which is a Yugoslavian reworked Czech vz24, and M.24/47 which are reworked Belgium and Yugoslavian made M24s.
And as far as knowing where Radionitsa/Radionica is located... last I remember, no one really knew, it's kind of a mystery, it's actually a holiday if you look it up, it comes up as the Day of Rejoicing or Commemoration of the Dead. Or....
I just never dug deep enough, I'd kinda be interested to know myself.