10.75 X 63 G MAUSER (Le PERSONNE)
This cartridge was likely the first of the rimless cartridges based on the G (Gründig) case type with a base of 12.55mm. It definitely precedes the 10.75x68 (M58) which is a longer neck version of this 63mm case version and is also likely to be introduced prior to the 9.3x63 (M56). It was produced by both RWS and DWM but which company introduced it first is not known. (Dixon)