1955 Mercedes-Benz 300 SL Alloy Gullwing - $6.8m

A rare 1955 Mercedes-Benz 300 SL Alloy Gullwing sold for $6.8m at RM Sotheby’s Scottsdale auction in 2020. It set a new record for the iconic model. A 1955 Alloy Gullwing that sold for $4.2m at Gooding & Company’s Scottsdale auction in 2012 falls to 2nd place. Chassis number 5500332 is one of only 24 aluminum Gullwings built. It is one of a handful to retain its original, numbers-matching 3.0-liter NSL inline-6 engine, high-speed 3.42 rear axle, front spindles and Rudge wheels, as well as the authentic alloy body and factory-correct livery.

The M186 Engine was a 3.0 litre single overhead camshaft inline 6, developed in the early 1950s to power the company's new flagship 300 "Adenauer" (W186) four-door saloon. It made its debut at the Frankfurt Motor Show in April 1951. Various versions of the engine (M186 – M199) produced from 115–240 bhp.

1970 Chevrolet Chevelle LS6 Convertible

Factory LS6 convertible. LS6 454/450 HP V-8 engine. Packed with performance components, the LS6 generated 450hp. The Chevelle SS 454 LS6 was America's most potent production car. M40 Turbo Hydra-Matic 400 automatic transmission. 4.10 rear end. Cowl Induction hood. Cranberry Red paint with Black stripes. Black convertible top. White bucket seat interior.

The 1970 Chevrolet Chevelle SS454 LS6 is firmly established as one of the most iconic and desirable machines of the classic muscle car era. There were 4,475 cars built with the LS6 454 in 1970, but how many were coupes, convertibles or El Caminos remains unknown. About 500 El Camino were produced. Some suggest there were only several hundred convertible LS6 made.

This highly original example appears at Mecum.

1963 Chevrolet Corvette Z06 tanker - $346k

26,073 miles. The newly styled 1963 Corvette Stingray coupe came with the optional Z06 package, which created a race-ready Corvette for an additional $1,818, a jaw dropping price. The Z06 Special Performance Equipment package added nearly one-half the base price to the cost of the Split Window coupe. For that money a massive 36.5-gallon fuel tank for long distance racing was included. 15 examples were built in 1963. Z06 Corvettes came equipped with the Rochester fuel-injected 327ci L84 V-8, rated at 360 horsepower and bolted to a four-speed Borg-Warner T-10 manual transmission.

Chevrolet assembled a total of 199 Z06 coupes, including 63 tanker versions. A Z06 Big Tank split-window coupe is the most desirable of all Corvettes. A 4-speed manual transmission and Positraction limited-slip rear end were mandatory options. To reduce unnecessary weight, most Z06 Corvettes left the St. Louis factory without radios.

2,610 Corvettes were equipped with the RPO (Regular Production Option) L84 engine for 1963, though just 199 were equipped with the RPO Z06 “Special Performance Equipment” package and only 63 came with the RPO N03 36-gallon long range fuel tank.

This 1963 split window Corvette coupe is one of a very few. It made $346k at Mecum.

2011 Ferrari 599 GTO

9,457 miles. 1 of 599 GTOs produced. Sold new by Continental Ferrari in Hinsdale, Illinois. 6.0L/661 HP V-12 engine. F1-Superfast 6-speed sequential transmission. Corsa Red with racing stripe. Carbon ceramic brakes with Red calipers. Factory car cover. Manuals. Tool kit.

Few cars carry the weight and reverence of “Gran Turismo Omologato.” Prior to 2010, only two models bore the iconic GTO badge: The legendary 250 GTO of 1962 and the 288 GTO of 1984. Both were created to satisfy rigorous homologation standards and have since become some of the most prized and collectable Ferraris ever built. Declared the most extreme sports car in the company’s lineup, the 599 GTO lapped Ferrari’s Fiorano test circuit a full second quicker than the vaunted Enzo. A mere 125 units were designated for the US market.

The 2011 Ferrari 599 GTO had a base manufacturer's suggested retail price (MSRP) of $416,550 when new. Few left the factory for that. The car appears at Mecum.

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1931 Duesenberg Model J Tourster by Derham - $1.2m bigh bid

The 1931 Duesenberg Model J Tourster by Derham is an extremely rare and valuable classic. Only eight original Derham Toursters built on a Duesenberg Model J chassis were built. Known for its sophisticated design by Gordon Buehrig and luxurious, open-air coachwork by Derham, it represents the pinnacle of American automotive luxury and performance from the era. $550,000 comprehensive restoration. Tourster body by coachbuilder Derham. 420 CI Inline 8-cylinder engine. 3-speed manual transmission. Black exterior. Black soft top. Beige interior. Bench seat. Jaeger Watch Co. chronograph. Duesenbird mascot.

The 420-cubic-inch (6.9L) straight-eight, dual overhead camshafts (DOHC) engine produced 265 hp, capable of propelling the car to speeds over 116 mph. The car was the epitome of advanced engineering, hydraulic brakes were novel for that time. The car appeared at Mecum.

1969 Chevrolet Yenko Nova - $852,500

29,454 miles. 1 of only 38 Yenko Novas produced for 1969. Sold new at Yenko Chevrolet in Canonsburg, Pennsylvania. Comprehensive restoration. L72 427/450 HP V-8 engine. M21 4-speed manual transmission. 12-bolt rear end. F41 heavy-duty suspension. Power brakes with front discs. Heavy-duty cooling system with upgraded radiator.

Car was powered by a 427/450 HP L72 V-8, factory-installed under Chevrolet’s Central Office Production Order program for dealer Don Yenko. It was the most dangerous car Don Yenko ever built. Brutally overpowered and underweight, the car was dangerous in the hands of most.

Yenko commissioned 99 Chevelles equipped with the monster 450hp engine. He also opted to produce a short-run version of the Nova with the same mill. 38 compacts rolled out, including this Fathom Green coupe. The car changed hands at Mecum.

The most expensive American cars sold at auction

1935 Duesenberg SSJ. $22m. Duesenbergs were the most extravagant vehicles of their era, serving as status symbols for the wealthy and famous. This roadster with coachwork by LaGrande is one of only two SSJ models built on the short wheelbase with the twin-carb supercharged engine. It was originally owned by actor Gary Cooper.

1962 Shelby Cobra. $13.7m. The first Shelby Cobra ever built. This prototype features unique characteristics not shared in later production Cobras.

1966 Ford GT40 Mk II. $13.2m. This GT40 made a second-place finish at the 1966 12 Hours of Sebring behind the GT40 X-1 roadster piloted by Ken Miles and Lloyd Ruby. Just eight Mk II GT40s were built.

1968 Ford GT40 Gulf/Mirage Lightweight. $11m. Jacky Ickx and Dr. Dick Thompson drove this car in its race debut at Spa in 1967, where it won. It also served as a camera car in Steve McQueen’s Le Mans.

1931 Duesenberg Model J Long-Wheelbase Coupe. $10.3m. This coupe, with Coachwork by Walter M. Murphy Company, was restored to exacting standards and won its class at the Pebble Beach Concours d’Elegance.

1966 Ford GT40 Mk II. $9.7m. This GT40 Mk II was campaigned by legends including Ken Miles, Richie Ginther, A.J. Foyt, Mark Donohue, and Peter Revson.

1969 Ford GT40 Lightweight. $7.8m. Equipped with its original body, chassis, engine, and transaxle, this small-block-powered GT40 lightweight was rebuilt and restored to its 1969 specification.

1957 Chevrolet Corvette SS Project XP-64 $7.7m. This car was the personal project of Zora Arkus-Duntov, the father of the Corvette. It shared little but the grille with its factory Corvette brethren.

1964 Shelby Cobra Daytona. $7.6m. Helping Shelby win the GT 3.0+ class at the 1965 World Sportscar Championship, just six copies of the Cobra Daytona were built.