As explained on The Typewriter Database, this Brother design is designated as type JP-7 and was introduced in 1975. The one I found dates from 1977.
I've found that Armor All wipes are a convenient way to get a good shine on plastic or paint.
Now the Kmart is ready to speak to someone else. Its companion at The Urban Legend Institute, the Olympia SM9 in the background, also dates from 1977.