Pro Patria -Castles on Stamps of Switzerland 1977
The theme for Pro Patria issue of 1976 was Castles. Swiss Post issued a set of Four Stamps on 26 May 1977. A FDC with First Day Cancellation of Bern is listed.
The Castles featured on stamps are
20+10 ct – Aigle Castle (Waadt Canton)
40+20 ct – Pratteln ( Basel Canton)
70+30 ct – Sargans ( St Gallen Canton)
80+40 ct – Hallwil Castle (Aargau Canton)