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Phrase Guide:

Valuable implies it was worth something when it was new, otherwise it’s just old.

Rare implies that you can't find it easily. This is not necessarily a bad thing.

Desirable means that people like it, but aren't willing to pay for it.

Collectible implies that someone else wants it, and that it will bring more money then it was originally worth.

One of a kind involves misguided spray cans. Synonymous with "restored."

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Buyer warning symbols:

Desirable Unopened Masi & Paramounts = DUMP
Collectible, Rare Atala Parts = CRAP
Bianchi, Urago, Legnano & Lambert For Sale = BULL
Schwinn Hollywood - Impeccable & Tiptop! = companion to "BULL"
Huffy = Self explanatory.

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Applying this new knowledge:

One of a kind, valuable, rare, restored, desirable collectible implies that you have just read the ad copy of a Craigslister, and that the item concerned is neither valuable, rare, desirable, restored, one-of-a-kind, nor collectible.

Avoid sellers full of Bianchis, Uragos, Legnanos, Lamberts and Schwinn Hollywoods that are in Impeccable, Tiptop condition.

-Kurt