Dearborn, May 17, 68 build date, X code/C6 coupe, 2.75 open rear.
A few markings coming to light, unsure if they make any sense.
Looks like a "2" and some other drip/squiggle below it, white-ish. (upper right of pic)
Maybe an "H" (on its side) and something looking like a small "V" in the square above. Again whiteish H and maybe orange/red V.
Some black that does not appear to be grime, but doesn't make much sense. (?) 9....
Any of this look remotely sensible...?