Back in the day when a buyer was allowed a lot of input on how their car would be built, some were ordered without the optional radios/tape players if the buyer wanted to do their own or didn't want one.
When something is optional and not included equipment, it's not a Delete, though that's become a popular phrase probably because it's shorthand for correct terminology.
As 6bbl says, a mistake would most likely be handled at the dealership, unless the buyer was credited instead.
To know exactly what happened, you'd have to talk to the original owner. Heck, maybe they just hated thumbwheels!
Some folks (like me) didn't really care for the stripes back then, and I still don't. Some folks gotta have AC if the temp is over 75.
Fun trivia: the guy who claimed to have pushed that through was Jerry Gross; he was a marketing type who I worked with at B&M in the '70s.