Here are some historic Simchat Torah flags:
From Russia, featuring Theodor Herzl and Max Nordau, co-founders of the World Zionist Organization. It is fascinating that these staunch secularist Zionists were celebrated at Simchat Torah services - apparently the idea that religious Jews were axiomatically anti-Zionist is quite wrong. (Nordau married a Protestant Christian woman.)
Woodcut Simchat Torah flag, late 19th or early 20th century.
King David celebrating Simchat Torah, Jewish Museum, New York.