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Polluting the thread a bit but in the same vein, but here is an Eduard Kettner DR w/ unique stamps for the tube maker. But when it comes to rifling, one could not engage anyone better than »WK«(script) - Wilhelm Kelber. Any ideas on the characters??

In addition to these tube mechanic stamps, there are 2 others being an odd »JY«and »K« in a Rhombus that have eluded me for a time......

Hochachtungsvoll,


Raimey
rse