I have a P2 that I know is authentic because it was sold to me by Karim Belhaj (now head of the company).
The metal butt cap on my cue looks just like yours, with the inscription "PREDATOR 2" and no serial number -- just like yours.
However, the bumper on mine appears different from yours. My bumper meets the beveled metal butt cap smoothly and has a sharp angle where the bevel meets the flat bottom of the bumper. Your bumper appears to have a diameter that is larger than the butt cap at the point where they meet, and it seems to have a curvature at the bottom. Both of our bumpers just push in rather than screw in and both have a sort of cloverleaf shape to the tenon (rather than a smooth cylinder shape). Could your bumper be a replacement rather than an original? Did Predator change them during the run of the P2's? Are the differences just from wear (yours looks well worn, mine looks new)? I don't know.
But the butt cap, joint collar, and joint pin look just like mine. I hope this is of some assistance.