One thing I saw online is to look for a tiny "w" cutout on the liners. I didn't check mine last night, but it's supposed to be on the underside (i.e. finger side) of the liners, near the back towards the lanyard tube. Not sure which side it's on, lock or non-lock side.
Anyone else heard of this or have a PM2 to check? The knife the guy posted a pic of was the Yojimbo2, but he indicated that it's not on all Spyderco models, but he was sure that theYo2 and the latest versions of the PM2 has the "w" cutout. It's pretty small. So small that it's easily overlooked.
While some fakes are good, I don't see the fakes going to this level of detail.