is this a Z fan?

[jonbills]

Is it or isn't it?

https://www.ebay.co.uk/itm/224224030297?hash=item3434cb2e59:g:0awAAOSw9fFfpVLW

It has very peculiar asymmetric fan blade spacing.

 

[SeanDezart]

I've never seen one like that...might have been fitted to a USA import but that doesn't mean it was OEM.