Rare M Code 'cuda (?)

The red cuda in this thread taken at Cruisin the Coast in 2015 is mine. It rarely goes to judged shows any more but when it does I install the original stamped steel wheels with dog dish hub caps. My car is R4 red while the one in question is R6 (I think). I have studied '69 M codes since 1999, am a member of the registry, and have attended many national events but this is the first that I have seen of the one with the white "slickback".