According to a few sources from former employees and some books this is considered the last casting to be fitted with redlines(excluding the 1982-83 Wisconsin toys redlines)

The Second Wind from 1977. Being one of the final year redlines it can also be found with black walls.

It was designed to look like the Speed Racer Mach 5 but it’s not officially a speed racer product. The Redline version is concerned a rare variation and even in rough shape one can be worth more than it’s black wall counterpart. Of course mine would be the exception to that rule lol.