I can't comment as i have never seen a fake one. My one has come with The original filter and brackets that's why I bought it and the first day stickers were on it. It is known that fakes of popular brands are made in Japan also.
I have had the Clarke 1.5 tonne jack for over a year now and it's possibly the best jack I have owned. It is really only a shop jack though as it's very low to the ground. I would definitely go with the Clarke jack