In 1990s, and possibly some time during 2000's, Thunder Cross was using another flag, where a narrow white swastika with much wider dark red borders (pattern modeled after the Latvian national flag) was placed in center and a small dark green cross crosslet ("Māra's Cross") was placed in canton, all on white field.
https://www.fotw.info/flags/lv%7Dperk.html
Tomislav Todorović