This article is talking about the 1984 model not 1989. I don't know the difference. All of mine say "Model M © IBM Corp. 1984", including what I'm typing this m

This article is talking about the 1984 model not 1989. I don't know the difference. All of mine say "Model M © IBM Corp. 1984", including what I'm typing this message on. I have purchased and tried other new mechanical keyboards, but I always find myself returning to my IBM. The others have invariably had wobbly, sticky keys. I will keep looking since I would like to use a keyboard without the numbers pad, which I never use and which moves my trackball 6" further right. Since I have three IBM keyboards, I think I'm covered until retirement. They will outlast me and I'll put them in my will ;)