this cartridge was made from DWM post ww 2

here the 1937 DWM catalog, notice that only the 22,5 gramm Rdkopf Teilm.(Rundkopf Teilmantel)- round nose softpoint was available in two loads:
No. 170 610 m/sec muzzle velocity
No. 171 670 m/sec

in the 1962 DWM catalog you have three different 22,5 gramm bullets
load no. 10620 VR (Vollmantel Rundkopf) full metall round nose
load No. 10621 TR (Teilmantel Rundkopf) soft point round nose
load No. 10622 TF (Teilmantel Flachkopf) soft point flat nose
muzzle velocity now 667 m/sec
all three loads are for the old pre war DWM No. (171) as you see so before the 1937 catalog the 10,75x68 was maybe also avialable with VR and TF bullets.
I think that DWM also sold Bullets but if kudue see this he can probably tell you more

the headstamp, the small L and O before and after DWM is iirc a postwar code for the year the cartridge was made

priceless: the 1937 catalog have the 11,2x60