Tag looks legit to me and fits right in with the VIN.
There used to be a blank spot on that firewall.
From an email 23 years ago:
> The trim tag is missing. Owner said tag was lost when car was painted black from its original color of Fathom Green. He said it originally had a vinyl top.
> The car has .... black standard interior, ....
> The engine assembly was all there but apart. The block had a sleeve.