I have a newer Matchbox of this... different color, though, obviously... I don't think Matchbox would intentionally produce a "cruddy rusty faded blue" diecast...
#4, JL still does their "Project in Progress" series. This would be a great candidate for that. My panel beater '71 Duster is one of my favorite JL diecasts. http://www.jlcollector.com/sf2004/sfr3pdust.jpg