I'm afraid I'm not of much help.
The problem is that these gauges are so easy to fake (and they are), that it is difficult to tell the real thing from the fake (or boosted DDR or other post war gauge).
Many of them were found in a lot of WW2 gun smiths kits that surfaced a couple of years ago, others came from DDR storage and had WW2 markings added.
I have seen a number of boosted Erma tools that I think came from the bankruptcy of Erma in the 1990s as well. A very difficult subject, this.
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