RM Sotheby’s is currently holding an exclusive sealed auction dedicated to rare and exceptional modern supercars. Running until 17 July, the sale features a carefully selected lineup of high-performance machines from the past few decades. Known for its private bidding format, this type of auction offers a discreet and refined way for collectors to acquire limited-production and one-off vehicles. Among the highlights are three standout cars that reflect the very best of custom craftsmanship and innovative engineering.
1995 Porsche 911 Speedster Remastered by Gunther Werks
Gunther Werks, a California-based workshop known for its dedication to the Porsche 911, has reimagined what the air-cooled 993 generation could have been if production had continued beyond the late 1990s. Their Speedster is not a simple restomod - it’s a ground-up transformation combining vintage inspiration with modern engineering.
This particular car features a full carbon fibre chassis and custom body panels, resulting in a convertible that is reportedly stiffer than the coupe version, despite lacking a roof. The weight savings and improved rigidity enhance both performance and handling. Underneath, a thoroughly updated suspension system includes computer-controlled damping, lighter structural components, and an advanced front lift feature for navigating urban roads.
Power comes from a rebuilt 4.0-litre flat-six engine, developed in collaboration with Rothsport Road and Race, pushing out over 430 horsepower. Every part of the engine has been reworked to deliver sharper performance while staying true to the air-cooled heritage.
Visually, the Speedster is finished in two-stage Tungsten Metallic paint and trimmed in a refined mix of Brandy and Onyx Nappa leather. A carbon fibre travel package - including a custom steering wheel and centre console - adds the final touch. Only 25 of these Speedsters were made, and this example, configured in right-hand drive for a buyer in Hong Kong, is among the rarest. It is registered for road use, but has only been driven during testing.
2009 Zagato GTZ Nibbio
The GTZ Nibbio represents Zagato’s signature approach to design: sleek, exclusive, and unmistakably Italian. Commissioned in 2013, this car is the eighth of just nine built. With the client’s approval, Zagato sourced a Ferrari base model with low mileage and pristine condition, then stripped it down for a complete transformation.
Marella Zagato, wife of company head Andrea Zagato, chose the car’s silver exterior finish, which pairs strikingly with a vivid red interior. The double-bubble roof, streamlined rear, and flowing lines connect the Nibbio visually to earlier Zagato creations like the 550 and 575 GTZ. Carbon fibre is used throughout the body, helping reduce weight without compromising style.
Performance is equally impressive. The 6.0-litre V12 engine delivers 613 horsepower, paired with a semi-automatic gearbox similar to those used in Formula One. High-end electronics control the car’s braking, suspension, and traction systems, ensuring precision on the road.
Since completion, the car has travelled fewer than 200 kilometres. It underwent a detailed inspection by Zagato in 2020, confirming its excellent condition. For collectors, the GTZ Nibbio is a work of contemporary automotive design rooted in a century-old tradition.
2012 Bertone Nuccio
The Bertone Nuccio is a true one-off in both concept and execution. Built to mark the Italian design house’s 100th anniversary, the Nuccio is named after Nuccio Bertone, son of company founder Giovanni Bertone. Its angular, futuristic look draws inspiration from the legendary Lancia Stratos Zero and showcases the boundary-pushing spirit of Bertone’s design legacy.
Over three months, the Nuccio was reimagined with a focus on forward-looking aesthetics, driver comfort, and modern performance. At its heart is a 4.3-litre V8 engine mated to a six-speed automated transmission, complete with paddle shifters for a race-inspired feel. A unique lighting system - with front brake lights that glow blue - was introduced as a safety feature for pedestrians.
The car debuted at the 2012 Geneva Motor Show, followed by appearances in Beijing and California. Despite this bold reintroduction, financial challenges led to Bertone’s closure in 2015. The Nuccio remained in storage until it was sold in 2018 as part of the company’s remaining assets and entered a private collection, where it has stayed since.
Having covered just over 29,000 kilometres, most of which were before the conversion, the Nuccio remains in remarkable condition. It stands as a rare reminder of what Bertone once represented: fearless innovation, individuality, and a commitment to advancing the art of the automobile.
