I saw these stamps on
ebay. I couldn't find this overprint in StampWorld, StampSmarter, SG and Scott (Scott just had to be unique so he placed Ryukyu under USA).
In a Ryukyu dedicated site I saw a similar overprint and the description said "Yaeyama District, Provisional Stamps. Postmaster Miyara Kenpuka seal" but not this specific stamp. The seller claimed CV 1000$, but as I said I couldn't find it in any catalog. Is anyone familiar with this stamp and can give more details? Is it indeed post-1940? Thanks
