Without even seeing the holster, I can tell you that there are no WaA 176 Luger holsters. Actually, there are no WaA176 holsters at all. So, if it is marked WaA176, it is bogus, or at least bogus markings.
I'm guessing, it's probably WaA170 instead. Which would include the following makers;
- E.G. Leuner, (bla), 1941
- Ehrhardt und Kristen, Liepzig (bdq) 1935, 1938-1941
- Ehrhardt & Kristen, Taucka, 1935, 1938-1939
- Albin Scholle. 1938-1939
- Otto Graf (bcb) 1940-1943
Hope this helps! If you get it, post photos here. Can tell you much more about the holster with photos.
Matt