This is an IBM Model M "Clicky" keyboard. They were made starting in the mid 1980's and a version is still manufactured today. This particular keyboard was made in 1989 and shipped with and IBM PowerStation 530, a UNIX box the size of a kegerator. Besides its overall quality and heft, one of the things that makes this keyboard particularly good for such a mod is the fact that it has removable key caps and the under-cap has a flat surface ideal for affixing a new key top. More →