Reproduction window sticker and in my opinion, the engine pad, transmission and rear axle stamps aren't factory original (the fonts aren't consistent with what I have in the database for that time period at LA). However, I would bow to Kurt (who's on vacation for a few weeks), as he has a lot more examples than I have.
And no, there shouldn't be a PTB stamp on a Van Nuys built Camaro!
For future reference, the VIN is 124378L338461
Ed