It's the centennial flag of Texas used in 1936.[1]
https://en.wikipedia.org/wiki/Seal_of_Texas#/media/File:Reverse_of_the_Seal_of_Texas.svg
Seal reversed originally made by Heralder. Edited by Xoere to match the original seal on the Centennial flag. Rearranged the flags, added to a flag, removed the shield, text, and banner.

Original creator: https://commons.wikimedia.org/wiki/User:Heralder