It doesn't matter if your replacement rotor is still ETA, it is more or less the same. I suggest you find a watchmaker to "silent" the rotor for you, they know what to do to make it quieter.I guess I'm more interested in the rotor noise, if this is possible then i will research and find a replacement. How much could ETA rotors cost generally if you know?
I doubt it, but maybe the rotor isn't properly screwed down?I've just had the watch hands realigned and it came back with a noise it didn't have before or at least the noise was there but its a bit more louder now.