If you took advantage of the chance to bid on those bargain Burroughs 205 toggle packages noted in the previous post, you may be interested in this Burroughs 205 memory drum now for sale on eBay. It is only the drum, and does not include the enclosure with the read/write heads.
But, most of us, even B-205 aficionados, have never seen the actual drum surface. This one appears to be a bit worn and may have suffered from head contact at the very least. Here are closeups from other pictures on the eBay listing.
The seller appears to have placed it on a clay flower pot which appears to make a nice mount for display purposes. I'm pretty sure that if I had been a Burroughs Field Engineer, I would have a bid in on this already.
With those toggles from the previous auction and this drum, you could be well on your way to forming a complete system in your basement or garage. You will need to do a little refubishing, of course, but if you even recognize these parts, you are likely to be retired and have the time.