T73 is the STANDARD 1969 Dart GTS tire: E70-14 "red streak" polyester cord
most probably a Firestone Wide Oval Deluxe Champion

this is the tire that only managed ~10,000 miles before they were junk as "carteravs" tells in his story. up

scope I have notes that this E70-14 tire is from a Dart, but I don't know what year blush

Moparts Firestone E70-14 RSW Deluxe Champion from a Dart DOT 0001419C.jpg