Mauser had it's factory in Oberndorf (until it was destroyed and pillaged in WWII). The patents being no longer recognized everybody started making Mauser 98s considerably varying in quality. The original Oberndorfs were of the finest quality at the time and have collector value because they are the original Mauser. The actions made by Mauser in the 30's are the most highly regarded. Steyr made excellent commercial 98 actions as did FN. The FNs continued until 1975 and are the best of the non-Oberndorfs.
The worst examples of commercial 98 pattern actions are the Chinese Sarco/Dumoulin, the Serbian Zastava and the Spanish Santa Barbara used in Parker-Hales. There were some nicely made DWM and BRNO
VZ24 and other military actions that were reused in sporting rifles but many of the military actions made during WWII were poorly made due to manufacturing shortcuts and money and material shortages.