I know I'm quite a curious guy!

Das Blank.In 2005, in a personal quest to improve his own typing speed and accuracy, Metadot Corporation founder and self-proclaimed “Uber Geek” Daniel Guermeur asked to have a totally blank keyboard created. To his surprise, his typing speed doubled after just a few weeks of use.
yea blank key seems to me like people would've used it to learn to touch type back in the daysHaaTa wrote:Blank keycaps were apparently common in typist classes in the 50's and 60's, if my memory serves me correctly.