I have an NOS one here and I have a pair of restored originals installed on my T/A.
(the quality of the chrome on these is poor enough that I doubt anyone would want to install an NOS pair on their car without having them rechromed first).
My NOS has the Chrysler part number tag approximately 4" from the chromed end "megaphone". There is a 3/16" diameter drain hole on the bottom of the pipe in the middle of the area around 6" from the end that installs in the muffler. The flat on the pipe leading into where it's welded to the tip doesn't have a distinct tooling mark like that shown in your picture.
And finally something I noticed on originals that I'm not sure if the repros have, is a small nipple or nub 1-3/4" from the end that installs in the muffler which is an indicator mark to how far the pipe inserts into the muffler exit pipe.
It's been a while since I looked closely at a repro, so I don't know if they have these details the originals have.