Issued today in 1976

Great Britain. Royal National Rose Society Centenary. Issued 30 June 1970. During repairs to the 13p cylinder, the face value of one of the stamps was covered. The covering was inadvertently left in place during printing, but the error was discovered before distribution and all examples supposedly destroyed. However, a used example (on cover with a Dover cancel dated 23 July) and two mint examples surfaced. Both mint copies are from the same position on different sheets: column nine, row one. Just one mint example, in pair with a normal, remains in private hands. The others are in the Royal Philatelic Collection.

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Issued today in 1959

Canada. Opening of St Lawrence Seaway. Issued 26 June 1959. It’s believed at least 21 uncut sheets of 200 stamps were printed with the centre inverted in error. According to official documents, the bulk were discovered and destroyed. However, five panes of 50 stamps are thought to have reached the market.

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