Modern Vintage Stamps from Norway - First Day Cover 1966
First day cover for Norway 1966 - Feat Sam Eyde 1866/1940 stamp and Kristian Birkeland 1867/1917 stamp.
Beautiful set of stamps dedicated to the Norwegian engineer Samuel Eyde and the scientist Kristian Olaf Birkeland. My copy (above) has a postmark on it, so I tracked down another version without the post mark at the excellent Postimerkki.
also worth checking: