This picture is terrible, but they look like the 1958 set of President Tubman's visits of European countries with the flags missing (frame only), or wrong flag (other errors too?).
https://www.linns.com/news/us-stamp...-europe.htmlhttp://www.philib.org/stamps.phpThe errors were deliberate to milk the philatelic market. Self-respecting catalogue editors (they are getting scarce) would not list such fabrications. Consequently, I wonder if anyone will pay even USD 500 for them nowadays.
You cannot be contacted until you have 50 quality posts.