I noticed these marks on my truck (70 C-10). I couldn't figure out why someone would have put them on the firewall, especially "blu" (I mean they obviously put it on there AFTER it was painted, right?) but then yesterday I noticed the same number on the inside of the RS fender when I pulled the inner and started thinking.
Are these factory assembly marks? Seems incredible they'd still be this intact after all these years if they are.
If they are factory marks, then I've been spelling her name wrong all along- its "Blu", not "Blue."
