50 years association of foreign banks in Switzerland - a long or a short timespan?

Very short if compared with the establishment of the "first foreign bank" in Switzerland in 1425 in Geneva by Cosimo de' Medici.

Still short if compared with the establishment of the oldest foreign bank still present in Switzerland in 1872.

A lot of things have happened in that "short" fifty years. Have a look at the anniversary video which gives you a quick overview.