I had chance to look at one of the fakes and with a small alteration, I think they would be pretty close to original.

I think the danger is when people buy them off ebay and don't realise they are fake.
I was shown some callipers in my local shop and could only tell the difference by the price sticker - one was 15 times the other.
I do have an un-trained eye though.
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mc18 F3, mc21 300, mc21ish sp, mc21/28ish.
cbr929, RC30, tdr250, rvf400, wave, gyro, joker.