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

[Brad H]

I don't know how rare some of these are but I'm told they are:

1) Original Mark-8 board set.  (Think there are less than 20 Mark-8s/board sets out there currently)
2) Tektronix 6800 Board Bucket (probably even less than above?)
3) Digital Group Z80 and 8080 systems + 2 cassette Phideck
4) Videobrain Family Computer

Am envying the Altair guys though.  I want one but they always come up at just the wrong time.