Radio delete plate help

[Ls6 Ragtop]

Jim,
That should have been one of my questions as mine has no casting number. The only other delete plate I've had was on a 70 SS which was a stamped steel plate that matched the madrid grain on the SS dash.
My 69 plate looks a little different than Mark's on the backside in that it's flat in the center and has a raised rib on each end. The metal clamp has an AS stamping on the inside but that's it. If mine is a repro I'd be pretty surprised, but that's why I'm asking for opinions as when I offer it for sale I don't want to misrepresent it.
Thanks, Chris