I use them on swiss-made PBX (Ascom) and ringers work well. Actually frequency should not be a problem - Europe uses 25 Hz ringer instead of 30 Hz in the US (half of power net frequency). But ringer voltage in the US is higher 90-110 V vs 60-75 V in Europe. This is not enough to give ringer the full amplitude. But some wood may resolve this issue: couple of matches to position the ringer coils perfectly on the metal core and it starts ringing on lower voltage. I want one day to put a KSU as well with the ringer generator for audible signalling. Then difference in voltage will not be a problem at all.
I have some vintage T&N items as well and of course some Bundes Post phones from the past. But they are not as robust as Western Electric phones.
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