I recall you had to press in on the turn-signal stalk to blow the horn. One of those "Better Ideas" from Ford!
Actually this set up was common in Italy, France and other European countries.
I believe the idea was to prevent unnecessary use of the horn, which was very common in Europe. I', pretty sure that
SOME European Fords, Opel, Fiat, Peugeot, Citroen, Renault, used the exact same set up as well.
The fines for using your horn in designated quiet areas in parts of Europe is VEEEEERY steep. It can be thousands of dollars for example, if it is a hospital zone.
Also in the recent past some car models actually had low volume horn settings that could be chosen by the driven depending on the environment.