Edinburgh Bicycle Co-operative 531 racing bike that I bought as a frame and built up myself. Black, light and handsome looking bike.
Had it for a couple of years and put in a lot of miles on it. Then I left it in my bosses warehouse for a few weeks as I went on a long holiday. Got back to discover he's been declared bankrupt and the VAT men had emptied the warehouse and sold everything at auction, including my bike.
I loved that bike. And as he was bankrupt he couldn't even give me any compensation as he'd lost everything including his house.