This is the more desirable multi piece construction Republic of China Flag WWII. The main body of the flag is a thin cotton, the blue panel is a thicker cotton and the white for the sun is a paper like material and the hoist tape is a heavy silk material.
A very interesting aspect of this flag is on the reverse the round part of the sun on one side is loose. Under that sun you can see Chinees characters.
A great not often seen WWII flag with that been there look!