If the rifle is a Yugoslav Model 48, it was made at the Kragujevac Arsenal after 1948. The Yugoslavs liked K98k type Masuers so well that they decided to make a whole lot more of them after WWII. 48 is for 1948, but I don't know the beginning and end production dates, nor the numbers produced.
Lots of these are being sold right now and the condition of most is almost like new.
The Yugoslavs also reconditioned masses of 98 mausers that they had before and captured during the war. These were from many different original manufacturers and various time periods. If you are good at knowing various little mauser marks, you can often figure out what they originally were. These are also being sold right now, hence the confusion.