"Small Baltic state" (ever heard of big Baltic empire in the 20th century?) was Estonia, it was a symbol of their air force.
Swastika as a solar symbol was a part of Lithuanian left-winged Nationalist Union (came to power after 1926 coup d'etat, ruled untill ocupation of 1940; established cca 191
. Swastika was considered to be a solely solar symbol. Similarly, youth organization "The Young Lithuania"m had their symbol - three flames connected in such way that they somehow resemble swastika.
Swastika as a solar and Pagan symbol was in use of many radical leftist German organizations, most notably - Thule society (dagger with swastika and oak leaves), Ludwik von Sebottendorf and many others. Freikorps who fought in baltic states sometimes had swastika at their helmets. Communistic historiography claims there was a German song "Steel helmet decorated with swastika [sign]". Finally - if the author is correct - swastyika was in use in the USA as a road sign in the pre-Nazi period. It is also stated Kipl;ing used swastikas as oriental sign.
Of course, this is historical background and after 1933.
Now, one question to mods: what about swastikas on a historic pohots here, at military-quotes.com? If I post a photo of uniform or any military equipment form Nazi Germany and all Nazi symbols are clearly visible (eagle with swastika; swastika alone; SS runes etc) - is it allowed to post or may I expected to hide these signs?