One of the most coveted American muscle cars has surfaced on the collector market for the very first time. A 1969 Ford Mustang Boss 429, a one-owner California original with all matching numbers, is being offered publicly after spending its entire 56-year life in the same hands.Delivered new through Culver City Ford in Southern California, this car is believed to be the only Royal Maroon Boss 429 sold by that dealership, making it a documented one-of-one. The vehicle has remained in California since new, complete with its original black plates and a comprehensive archive of paperwork, including build sheets, invoices, and registration records.The Boss 429 program was Ford’s answer to NASCAR’s horsepower wars, requiring at least 500 street versions of its semi-hemi 429 cubic-inch V8 for homologation. Because the massive engine would not fit on a standard Mustang assembly line, Kar Kraft reengineered each chassis by hand, relocating shock towers, reinforcing the frame, and revising the suspension.Though officially rated at 375 horsepower, the engine was widely understood to produce far more, designed to withstand the demands of sustained high-RPM racing. This example retains its original numbers-matching engine, Toploader four-speed manual gearbox, 9-inch Traction-Lok differential, and factory decals. Its interior remains unrestored, finished in black with bucket seats, a console, and period-correct trim.AdvertisementAdvertisementAdvertisementOnly 850 Boss 429s were built for 1969, and just 122 were painted Royal Maroon. The rarity of this car is compounded by its single-owner provenance, documented originality, and listing in the Boss 429 Registry. Recently serviced to ensure drivability, it remains ready for both show competition and road use.Priced at $595,000, the car represents more than a muscle machine—it stands as an investment-grade piece of Ford’s racing legacy, unlikely to be duplicated in provenance or preservation. See it here.When you choose Stephen Becker Automotive Group, you’re not just hiring a company—you’re working directly with one of the most respected names in the collector car world, backed by nearly five decades of proven expertise.For me, collector cars aren’t just machines—they’re living history, filled with stories worth preserving. I’ve spent nearly five decades helping people find, restore, and protect the cars they love, and I handle every project as if it were my own. When you call my office, you get me—not a middleman. From our very first conversation to the moment your car is delivered (and long after), I’m personally involved in every detail. If you’re looking for a trusted partner who will treat your car with white-glove care and your goals with the respect they deserve, I’d be honored to work with you.Follow us on Facebook and Twitter