917b Yugoslavia MNH DOUBLE RED -  block of 4 - see scans. Beautifully centered.  RARE - Note - Only the red field in the flag is doubled, the country name is not printed at the same time as the flag.

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Check out my books on the Overrun Countries Series available on eBay...
                 Book 1 - The Poland Stamp & Its Varieties
                 Book 2 - The Czechoslovakia Stamp & Its Varieties
                 Book 3 - The Norway Stamp & Its Varieties
                 Book 4 - The Luxembourg Stamp & Its Varieties

                 Book 5 - The Netherlands Stamp & Its Varieties

                 Book 6 – The Belgium Stamp & Its Varieties

                 Book 7 – The France Stamp & Its Varieties

                Book 8 - The Greece Stamp & Its Varieties