There seems to be an "FPE Schaltgeräte GmBH" in Karlsruhe, Germany listed on the label but no indication of the actual production. It's a bit hard to read since the picture is so small.
I googled that name and actually found an extract from a 1962 address directory that includes an ad for FPE. According to that full-page ad the Stab Lok MCBs were actually produced in Germany for the entire European market, production began in 1959.

Here's the ad:
http://digital.blb-karlsruhe.de/blbihd/periodical/pageview/631182

Despite their claims on successful marketing FPE was never actually common in Europe. In fact I've only ever seen two FPE Stab Lok panels in Europe! According to the electrician who posted the picture on Facebook FPE was for some odd reason popular in a small area of Germany a few hundred kilometres north of the FPE factory. Maybe a local wholesaler there was in touch with FPE and got good prices!