The Keller Collection will form the centrepiece of Bonhams’ Zoute Sale at the Zoute Grand Prix in Knokke-Heist, Belgium on October 11, 2026. Assembled by Swiss collector Christian Keller and his late brother, the 12-car collection will be offered entirely without reserve.
Its leading entry is a 1970 Lamborghini Miura P400S estimated at between €1.6m and €2m. Chassis 4578 is one of 114 late-specification P400S examples fitted with ventilated disc brakes. The Miura is finished in Giallo Fly over its original Nero leather interior, having originally left the factory in Arancio Miura. It was delivered to Switzerland through Garage Foitek in Zurich and is believed to have been bought new by Swiss racing driver Emmanuel ‘Toulo’ de Graffenried. The car has remained in Switzerland throughout its life and has rarely been seen publicly. It is accompanied by a report prepared by former Lamborghini test driver Valentino Balboni in December 2014.
A 1989 Lamborghini Countach 25th Anniversary will also be offered without reserve. One of 657 produced, it was delivered new in Italy in Rosso Siviglia over Beige leather. The Countach shows 23,084km and has formed part of the Keller Collection since 2014. Its original owner’s handbooks accompany the car, which is estimated at €500k-€600k.
Five Ferraris from the 1970s are included. A 1973 Ferrari 365 GTC/4 is estimated at €120,000-€150,000, while a 1974 Dino 246 GT carries an estimate of €240,000-€280,000. A 1977 Ferrari 512 BB is estimated at €130,000-€160,000. Two 1977 308 GTBs complete the Ferrari entries, with estimates of €55,000-€65,000 and €65,000-€75,000 respectively.
The Italian contingent also includes a 1966 Fiat Dino Spider 2000, estimated at €70,000-€80,000, alongside two Maserati Ghibli 4.7s. The 1967 car is estimated at €80,000-€120,000, while the 1969 example carries an estimate of €90,000-€130,000. Two Porsches complete the collection. A 1992 Porsche 964 Carrera RS is estimated at €180,000-€220,000, while a 2008 Porsche 997 GT3 Cup S is expected to make between €60,000 and €80,000.
Speaking exclusively to Magneto, Christian Keller explains that his fascination for machines has been ever present – but when his brother bought his first car, an Alfa Romeo Alfasud, the passion really began. “From that moment on, cars were never just a means of transportation to me,” he says.
The first true ‘collection car’ was a Maserati Ghibli – a model that gets to the heart of the collection’s theme. “We deliberately focused on sports cars from around 1970 – a decade whose designs still captivate me today. Their lines, their proportions, their unmistakable character… that era produced shapes you simply don’t forget,” Christian explains. “Because of our age, we never felt a real connection to vehicles from earlier decades.”
There wasn’t a strict philosophy when building the collection, Christian says. “What we have today is shaped entirely by emotion. Of course, the possibilities of the classic‑car market also influenced what found its way into our garage, but at its core the collection grew from what moved us. When my brother started driving a Porsche privately, he developed a keen eye for German engineering. My own affinity, however, has always remained firmly with the iconic Italians.”
Christian says his brother had to convince him of the joys of Porsches. “Today, the Porsche 964 RS is the car that carries some of our most wonderful memories,” he says. However, the collection-building was truly a team effort. “Both of us had to be convinced before adding a car to the collection. As brothers, we always managed to find common ground in the end. My older brother had far more experience with cars, so it was not always easy for me to persuade him with my arguments – but that dynamic shaped our choices and made every decision meaningful.”
The duo looked for cars with certain qualities: historical significance, iconic design and impressive engineering, Christian says. “It was also important to us that the vehicles were as original as possible, with a clear understanding of their provenance and history.”
The art of collecting has left Christian some fond memories, and some tricky acquisitions. “We bought one of our Ferraris in Belgium, near Ghent. I travelled there twice to secure the car. For the first visit, I drove from Switzerland to Ghent, took a brief look at the vehicle and then turned around and drove straight back home,” he recalls. “That very long trip is still vivid in my memory. In the end, it was worth every mile, because the Ferrari 365 GTC/4 became part of our collection.”
There are also fond memories attached to the Porsche 911 GT3 Cup S, bought with the intention of taking part in private track events. “That was a goal we both shared for the future. Unfortunately, we never reached that point, but the car still represents a chapter of ambition and excitement in our collection,” Christian says.
Christian says the Lamborghini Countach is an important acquisition. “It’s one of the highlights of our collection – the anniversary model with carburettors and in virtually as‑new condition,” he says. Yet it is the Ferrari 512BB that stands out as his personal favourite. “Its 12‑cylinder engine is, to me as an engineer, a technical masterpiece of its era, wrapped in an exceptionally appealing design. It represents the perfect blend of engineering brilliance and emotional allure.”
However, with the passing of Christian’s brother, the time has come to sell. “The choice was made about two years ago, with the final decision coming at the beginning of 2026,” Christian says. “Due to the passing of my brother, the emotional connection to these cars is no longer the same.”
As such, he is keen that the collection’s future custodians understand that it is more than a group of historic vehicles. “It was born from the shared dreams of two brothers.”
Away from the Keller Collection, Bonhams has also announced a 1965 AC Cobra 289 for the Zoute Sale. Estimated at €700,000-€900,000, it is one of 45 COB-numbered leaf-spring cars built in right-hand-drive specification for the British market. Originally supplied in Vineyard Green over Beige, the Cobra was later converted to left-hand drive and repainted red before being exported to California. It retains its original chassis, body and engine, and has a documented ownership history dating back to 1965.
More details on the Keller Collection and Bonhams’ wider Zoute Sale can be found here.
