Confirmed by Karl Koch as being fake.
Karl on fake items:
"Sadly theres no way to stop them, and really, its buyer beware on all autographed items, not just weezer, so its up to the fans to think before they get ripped off.
Wish I could do something about these. Unfortunately if I explain the subtle differences online, it just educates the forgers better."
I'm adding a further section to this page about bootleg items - these will mostly be vinyls or CDs that have been privately manufactured, and usually feature tracks that can be found on compilation albums, or are freely available to download at any good weezer fan site.