i agree! Most humbly.... This iS a Printers Proof Card, I've had many of them, mostly sold now though. i would Love to see a scan of the Back.(Please, if possible?)
This is what i would do if the card were mine, i would Not fear a regrade at all(i mention this because of the older PSA slab, ie rounded frame). Sending it to SGC for their Slabbed oinion is the Real Deal Ticket to authenication.
just my 2 pennies worth
Oh yeah, also, you might want to magnify the the Proof line to see what if any other colors can be seen(sometimes not with the naked eye).
"Sweet Card!!!"