Chopard

I am looking to buy the MM GMT. When I look at it on the Chopard website, the bezel says "tachymeter". At the AD, the watch says "tachometer". Which is correct? Is there a chance that I am looking at a fake?

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What's scary is that the Chopard store in NY has no idea about this. The guy I spoke to said that all their watches are spelled "tachymeter" and that if I see one with "tachometer" it must be a fake. I know this isn't true. The watches being sold by ShopN...