my budget is 1000€ at max.
I don't want to buy a mauser in usa, but only informations on this very beautiful gun. Informations like:
which year, whick details are more important in the choice, what I must control in the mechanism...
all the problems of a beginner!!!!
If you want a beautiful rifle to shoot, there are plenty of the Yugo captured K98k and 98/24s around in Europe. With some luck you will find an Israeli K98k in .308Winchester that is a formidable shooter that has been rebarreled in Israel.
Norway had rebarreled many K98k to .30-06.
For collecting purposes, I would go with an early gun made before 1944 with better machiining and finish.
There were many details changed over the years, from the solid walnut stock to the laminated stock, from the flat butt plate to the high one, the bolt take down was later no longer an extra part ( actually two parts) going through the stock but just a hole drilled though the butt plate. The machined triggerguard and magazine housing became a cheaper metal stamping.
Also the front rings saw several changes, from machined with grooves, those omitted and finally replaced with stamped and welded rings.
To get started, you should get the proper literature and buy your first K98k, once you hold it in your hands, field strip it and inspect it, many seemingly complicated things will be self-explanatory.