In the edit style is 2460 (1917) flag again, because at that time the country Thailand has announced its participation with the allies to battle with German Austria and Hungary. In World War 1.
BC 2460 has amended the flag of another nature. Since then, Thailand has announced its participation on the Allied side to battle with Germany, Austria and Hungary in World War 1.
In the 2460 has revised the flag again. Since then, Thailand declared themselves to join the allies to battle with Germany, Austria and Hungary in World War 1.