Update: I destroyed 1,000 of the Kialara Original discs with serials. I started by laying out ten of them, and gave them each a light strike with the claw end of a hammer. It was simple enough that I was able to do the other 990 fairly quickly.
I honored a few requests before I discontinued these for unique serials... 1500, 2000, 2500, 2222, 2345 and some years (1944, 1979, etc) There are maybe a couple dozen in circulation with serials higher than 1450. In hindsight, had I known I would discontinue these, I probably would not have honored these requests.
If anyone is wondering why I did this... for one, I am a little burned out of this design, and outsourcing isn't an option due to difficulty - there's a learning curve to assembling these. Also, less in circulation means everyone owns a larger percentage of the supply - so it's a good thing for everyone I would say.
Proof:
http://imgur.com/a/URm3l