First-day cover «Overprint at Swiss railway stations»

Déjà vu? That’s right: the two designs, of Lucerne and Brig railway stations, were originally issued in 2016 as part of the “Swiss railway stations” definitive stamp set. Because not all of them were sold and the face values have changed, the remaining stamps were simply lying around in stock. But the train for the stamps hasn’t yet left the station: Swiss Post gave the “old” stamps a second chance by overprinting them with the current face values.