Date of Issue 15th February 2017
one stamp (1st class value) out of a set of 6 stamps (only this stamp is bearing the official Europa logo)
NOTE: it's the fist time a stamp will bear both the WWF logo and the Europa logo !
Both thematics are very popular among philatelists which means this souvenir-sheet is a must have !
Sir Martin Ryle - In 1959 the Radio Astronomy Group at the University of Cambridge led by Professor Martin Ryle published the Third Cambridge Catalogue of Radio Sources (3C) which led to the discovery of the first quasi-stellar object (quasar). It was a landmark map of stellar sources and Ryle’s work led to confirmation of the Big Bang Theory. Ryle was knighted in 1966 and awarded the Nobel Prize for his work in 1974.
"Great-Britain as many other countries issued their first Europa stamp in 1960, then their issues where irregular: 1961, 1969, and then non-stop since 1980 only (with an exception in 2000) even if some British territories as Jersey, Guernsey or the Isle of Man produced Europa stamps since the mid-seventies!
Great-Britain as the inventor of the "stamp" is the only country in the world issuing stamps without adding the name of their country on it, only the face or the monogram of the Queen (or King) is shown on them.
The British Europa stamps are often part of a larger set where only some of the stamps are baring the Europa stamps logo."