Typesetting fonts exist in many variations, both modern and vintage. I doubt that a “standard” Fraktur existed. I know when I studied German in college (a long time ago) all of my textbooks were written in Fraktur, so I usually do not have any particular problem in recognizing the various images posted (when the focus is clear! :)). I suspect that there is/was a considerable difference in printed publications and very likely some differences in the official fonts used on German government weapon inspector’s stamps. They very well may have been different depending on the year and/or arsenal (Spandau, Erfurt, etc.).

To my eye, the example alphabet posted by Klaus looks a lot like Old English "Black Letter" font rather than Fraktur.

On p. 463 of the G&S book, the caption for Fig. 9-2 illustratiing the "Inspector's Alphabet" states that the typographical representations corresponding to those in Klaus' alphabet are "in an Old English/Textualis font." It goes on to say that "...the basic forms shown here, which as can be seen, mostly more closely resemble the more ornate and calligraphic style of Textualis, rather than true Fraktur." I am now in way over my head but the fact that this figure also includes photos of inspectors' marks that very closely resemble the typographical ones confirms that this alphabet was used by inspectors. It does not, however, indicate it was the only alphabet used.

My head is beginning to swim. Who was the idiot who started this thread, anyway?