Actually it is the other way round, Oberndorf produced commercial Mausers with no
"Oberndorf" anywhere on the receiver. One way to tell if it is an Oberndorf it a
serial # just behind the recoil lug and another matching # on the back of the mag. box. This
serial # can also be used to establish the date of manufacture.

Should it have DSTs, they are integral to the bottom metal same as a Brno 22H, not
an after market unit installed afterwards. The trigger guard loop is also different - a bit larger
than normal. And yes you can find "Oberndorf" on almost any military Mauser - they were first and foremost an arms manufacturer. No flies on a military Oberndorf 98 based rifle but as pointed out the commercial was a bit different. TTBOMK - FWIW. --- John