I have 2 of these and still pull them out to play with all the time. There us just something so tactile about the feel in your hand, especially while turning o

I have 2 of these and still pull them out to play with all the time. There us just something so tactile about the feel in your hand, especially while turning over a calculation. I collect "old mechanical technology" but these are one of the prides of my collection. There are only only a couple people in North America that can still service one.