I just had to give the owner some bad news then. I looked it over before mounting it and found this lovely crack, how people don't notice these things I don't know.
3rd July 2013... if it's real, it's a very early one; I checked back, and the first Yonex video - the one before we even knew what it was called - went on Youtube in August 2013.
I've done a couple of these, I'm sure my mates (who I know is genuine) had a more obvious zig-zag grommet pattern.