The one I'm typing on is vintage '87, and that's all I use (5 are in active use between household and work) but I have several from '84 to '94 stored as well, so if there comes a day when I can't repair one of my keyboards in current use, I have 5 full spare keyboards plus *lots* of spare parts... I don't plan on ever being without a Model 'M'.

[[ Edit for linguistic clarity... ]]