WaA101 - Waffenamt Inspectors Number (Auwaerter & Bubeck) and three others, but none of them were "nka"
nka is associated with J.j. Schlayer AG, Lederfabrik. Reutlingen (Wurttenberg).
(German Ordinance codes: p. 211 Luger Holsters & Accessories of the 20th Century)
The style, however, is certainly not for a Luger.
Hi-Power is as good a guess as I can come up with.
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