8 of 4,352 chassis match · showing 1–8 · sort: Highest price · Oldest first · Clear filters

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  1972 Porsche 911 Carrera RS 2.7 pre-production prototype

  9113600012prototypeGermany

  2.7L flat-six

  Signal Yellow

  Sold US$1,325,000 · RM Sotheby's
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  1972 Porsche 911 Carrera RS 2.7 development prototype

  9112301609prototypeGermany

  2.7L flat-six with Bosch mechanical fuel injection, ~210 bhp (prototype unit)

  Fluorescent yellow

  Estimate US$700,000 – US$900,000 · RM Sotheby's
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  1933 Marmon HCM

  DD609prototypeUnited States

  6.0L (368 cu in) overhead-valve aluminum V-12, 151 bhp at 3,700 rpm

  Light tan

  Sold US$429,000 · RM Sotheby's
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  1975 Porsche 911 Turbo Carrera (Type 930) pre-production prototype

  9306800014prototypeGermany

  3.0L air-cooled flat-six, single turbo, Bosch K-Jetronic fuel injection, 234 bhp

  Oak Green Metallic

  Sold US$341,000 · RM Sotheby's
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  1970 Iso Grifo GL Series II (IR8)

  GL 050336prototypeItaly

  Chevrolet 350 cubic inch V8, paired with five-speed ZF gearbox

  Polo White

  Sold US$264,000 · RM Sotheby's
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  1974 Abarth SE 027

  SE027-001prototypeItaly

  1,986cc DOHC 16-valve inline-four with Lucas indirect fuel injection, 280 bhp at 9,000 rpm

  Sold £168,000 (≈ $210K) · RM Sotheby's
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  1936 Pierce-Arrow Twelve Town Car Prototype (Derham coachwork)

  3150069prototypeUnited States

  7.6L (462 cu in) L-head V12, three-speed manual with overdrive

  Dark blue with silver accents

  Sold US$187,000 · RM Sotheby's
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  1938 H.R.G. Airline Coupé (factory one-off prototype coupé)

  WT68prototypeUnited Kingdom

  1.5L OHV inline-four, 55 bhp, sourced from Triumph Gloria

  Sold US$176,000 · RM Sotheby's