71 Dodge Dart Swinger super six
I saw that too. Edit to add: But I found this pix of the same marker opening in a '72 Duster:
http://www.forabodiesonly.com/mopar/showthread.php?t=262026 So this looks stock.
As an observation, my late production '70 Ranchero had plenty of parts that had the '71 year part numbers marked on them. (If you were never into Fords of that era, the PN's contained info that indicated production year.)
But here is my question to all (being a newbie at this date stuff): Does it matter much as to value on this particular car? This is not a $25-30k car being claimed to be all original.
Sent you a PM, Kenicb....