You don’t get much rarer than a one-off prototype. The good thing is, not only has this one been well preserved, but the running gear should be reasonably easy to maintain and obtain parts for.
From the seller: “PROTOTYPE FOR YKC RAIDER THAT WAS NEVER BUILT, SO THIS IS A ONE OFF, ITS CHASSIS NUMBER ONE, ROVER V8, 5 SPEED GEARBOX, NEW CLUTCH LAST YEAR, RED PEARL PAINT 3 YEARS OLD LOOKS GREAT IN THE SUN”
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TAG HEUER Edge Prototype in Good Condition, No Damage

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Original Supermarine Archive Spitfire Prototype Photographs Mid 1930's

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Flare Audio E-prototype Earphones

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Rare GSM Ericsson "Hedvig" - Unreleased Concept Phone - Scarce Prototype (2000)

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Callaway “Prototype” irons. Used set from PW- 3 iron plus extra 2 iron

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PROTOTYPE. CNC Milled Putter - USA Putters Nickel Plated - 350g