Recently I brought a used, semi-new sennheiser, and result to be an imitation. Apparently there are quite a lot of falsifications of both brands, very well made. The guy I broutg from had no idea and he purchased in amazon. The mic had higher feedback than spected and some lack of low frequencies, for the rest in aparience it was identical.
Here is the blog i took the information from to verify:http://chrisw.me.uk/real-and-fake-sennheiser-e945-mics/