National Philatelic Exhibition (NABRA), Bern from August 27 to September 5, 1965

The souvenir sheet on the first day cover was issued for the National Philatelic Exhibition (NABRA), held in Bern from August 27 to September 5, 1965.  This is the companion issue to the regular commemorative 10 C. postage stamp, though the imperforate stamp designs in the souvenir sheet depict differing denominations of the 1854 Imperforate Sitting Helvetia postage stamp series.

The proceeds from the sale of the souvenir sheets benefited the exhibition and the promotion of Swiss philately.