I don't see how someone could recreate a whole Valve themselves, and only make one. Someone testing their machining skills is already doubtful given how close it is in detail to a manufactured piece. But he/she would also have to be recreating something similar to O-matter and creating a Valve the exact way Oakley did. Casting marks are proof of that to me. Here's close-ups of the tips of the ear stem and its differences to a manufactured piece. Both are close in design. But there are slight but noticeable differences in the shape of both. Just like the piece that holds the nose rubber is similar in design. But that is also slightly different. To me it looks like a rough draft Valve.
- Lopaka KaMars
I was about to say that you don't need to replicate the whole thing, just the metal lug. The rest can be either reused parts or customized versions of them. But now that I take a closer look at the pics you re-posted, the fonts used, the nosebomb mounting, the finer details of cast marks vs. Oakley's, etc. look odd. Not that Oakley doesn't have many variations of fonts, nosebomb mountings or casting marks on any given model (I even made a post a while back about OTT "CE" and "Made in the U.S.A" markings), but I'm not sure I'd give the opinion that your Valve is authentic given its consistencies. But like I said, my opinion (any anyone else's for that matter) is useless without strong provonence from Oakley. Good luck on your quest to uncover your mystery.