1967 original paint marking stamp under paint

[1967camaross396]

Found a stamping on the rear tail light panel after stripping the original paint and primer it's a round circle with a bunch of letters I can't really make it out but in the picture you'll see it says oil and there's a number seven. Found this quite interesting has anyone seen this before thanks Tom

[Petes L48]

Yep.  The OIL is likely a partial of the word COIL from the marking stamp.

http://www.camaros.org/forum/index.php?topic=17712.0

[R68GTO]

Looks like a Weirton Steel stencil.

[67CruiseMaster]

Manufactured panel that was made from a steel roll. Manufacturer supplier of rolled steel

[jcihos]

Saw similar markings on my 68 when I brought it down to bate metal also.