What is the rarest thing you own?

[Chaotic42]

I don't really have anything special - a few low-print math books, a CD of Soviet anthems from Russia, and the Final Fantasy VI OST from Japan are probably it.

 

[snoopy7548]

Maybe some of my vacuum tubes. I bought a whole bunch (mostly 6SN7/VT-231, 6F8G - mostly all National Union, Tung Sol, and Ken-Rad black glass) on eBay over six years ago. They'll only get more rare, and are now worth 3-4x what I originally paid for them. I think I even have a Sylvania 6SN7 "Bad Boy" that I found at a flea market. The set I never bought because they were too expensive was the GEC 6AS7G, and now they're really rare.

 

[spacejamz]

Metallica autographs from 1985, including their original bass player Cliff Burton...RIP...