It was a common practice to use rejected cases for the manufacture of Platzpatrone 33. I doubt that the headstamp had anything to do with the round posted being a blank. Reverse headstamps and otherwise out of order headstamps are not uncommon on German 7.9 x 57. Some makers seemed to have made most of their cases with the headstamp in that fashion. They exist in 7.9 x 33 and 9 x 19 mm as well. They are often seen in their correct ball (or other) loadings, which lends credence to the belief that the headstamp style of itself was not cause for rejection.
In some occupied countries, they never approximated the German style of headstamp even though they carried a German assigned factory-code number. On 9 mm Para, the codes “pjj” and “qrb” come to mind. The opposite is true also. The factory initials SB" and “Z” from Czechoslovakia appear on otherwise completely wartime German style headstamps, believed to be made primarily for export to neutral coountries like Sweden, or for internal use of the home country’s police, etc.
Admittedly, a thorough study of German headstamps, especially from the Third Reich era, is a daunting task and sometimes lead to the conclusion that there wasn’t much order in “Deutsche Ordnung.”