Roundel of the Latvian Air Force as used 1926-1940 (earlier there was used a mirrored image). Thin black border was not a part of roundel, but was drawn for better visibility. Note, that this sign was adopted long before Nazi swastika and has no connection with Nazis.
self-made, converted non-vectorized version Image:Latvia roundel 1940 border.png
Photo
Hierakares