Helvetica swiss postage stamp Pro Patria 1973

swiss Helvetica postage stamp pro patria 1973On one of the Swiss postcards that arrived there was a special stamp from Swiss Post Helvetica.
The stamp is part of the Pro Patria 1973 V4 series. The design is from the Lenz brothers.
This stamp shows a portrait sculpture from the Historical Museum in Bern.
A search revealed that the stamp year is the 1973. The Pro Patria V4 series presents archaeological finds.
A very nice stamp that is worth showing here.
Happy postcrossing