There's another one of these L15 KVK1s on e-stand right now, described as a "Schickle". But Schickle went out of business in 1941 before zinc was used (at least for combat badges for which there are no zinc examples), so Friedrich Orth certainly is the more logical attribution.
Unless there's something I don't know about -- was zinc used much earlier for KVK production unlike all the combat badges?
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