What's the rarest or most unusual computer-related item do you own?

[William Maddox]

Rarest:
Computer Control Company (3C, later Honeywell) DDP-116 minicomputer (2 complete, 1 missing front panel)
    Discrete germanium transistors, first 16-bit minicomputer, first of the Honeywell "Series 16" line.    Provenance of machines is NRAO Green Bank, controlling the Green Bank Interferometer until 1999 or so.

Original glossy marketing brochure for Univac I.
Univac I pluggable module

Most expensive:
    $15k for "low mileage" Straight-8 (Typeset-8) with dual TU55s, TC01, DM08, DF32, and high-speed reader/punch control

--Bill