Roger Holmes wrote:
A couple of [keypunch drums] have come up on eBay in the last five
years and both went for silly money which to me means there are
more keypunches than drums.
That's one interpretation, but it just considers the scarceness factor.
You also have to figure in the saneness factor. If you want a punched
card era memorabilis, a drum is a heck of a lot easier to ship, store
and display than a whole keypunch machine.