Lew - that drawing was from an article I did on these gauges many years ago. I established that way to show all the markings in one plane. The article was in the January 1978 Issue No. 165 of the International Cartridge Collector, pages 7-11. I believe this was the first article ever to appear on these gauges. It only showed none gauges. At the time, I think only the “gmm” gauge, the first one pictured in the article, was mine. Today, after 40+ years, I have only 7 of them from pre-1946 Germany. I mention that because I also have some from the DDR that are basically the same design, and sometimes are mistaken for the Third Reich era gauges.
I have never seen an early 9 mm gauge, from the pre-NAZI era in Germany, but when I had my 7.9 Collection, I had 25 of these “Stahlpatronen” in that caliber, including two from the Reichsheer that instead of the NAZI version of the eagle (Reichsadler) before the WaA number, they had a rendition of the Imperial Eagle, which I guess was still used during the Weimar Era. These were all, both 9 mm and 7.9 x 57 mm, headspace gauges. A few of the 7.9 gauges included a full bullet profile, for reasons unknown to me.
Six of my 9 mm Gauges are marked for the German Army (WH - Wehrmacht Heer) while one is marked for the Luftwaffe (WL - Wermacht Luftwaffe). All seven of the gauges are inspected by WaA 42. Of the nine gauges shown in the article, seven were inspected at WaA 42, one at WaA 419 and one at WaA 512 10. They were not mine and I have no gauges reflecting those Heeres Waffenamt numbers in my own collection now.