This Ford Mustang Boss 429 is a time capsule. Chassis KK1877 is a Black Jade SportsRoof that's managed to hang onto its original paint and all the big-ticket drivetrain bits, with only 13,670 miles racked up since '69. Factory markings? Still there. Rare parts? Check. There's even an authentication report to keep the purists happy. Richmond Auctions is putting it on the block at the Savoy Automobile Museum's first-ever Fall Spectacular, and the current bid sits at $200,000.1969 Ford Mustang Boss 429Richmond AuctionsWhat It's Worth Right NowIf you're wondering what these things go for, Classic.com says the average sale price for a 1969-1970 Boss 429 is $315,382, with a market benchmark of $388,684. That's across 214 sales, so it's not just a fluke – these cars are serious collector bait.Dial it in to just the 1969 models, and the average jumps to $471,692 from 26 sales. Prices have swung from $175,000 all the way up to a jaw-dropping $1,045,000. It all comes down to condition, history, and the nitty-gritty details.1969 Ford Mustang Boss 429Richmond AuctionsWith just 13,670 miles, original paint, a matching drivetrain, and paperwork to back it up, this Boss 429 is ticking all the right boxes for collectors. The $200,000 bid is well below the averages, but the real story will be told when the hammer drops.Condition and DetailsDressed in Black Jade, this SportsRoof comes with a Deluxe interior, four-speed stick, and a 3.91 Traction-Lok rear. Richmond Auctions calls it one of the most original Boss 429s left. Out of just 859 built for 1969, this one still has its numbers-matching engine, transmission, and rear end. Mileage? Still at 13,670.1969 Ford Mustang Boss 429Richmond AuctionsThe body? Mostly untouched. The paint meter says it's still wearing thin factory paint almost everywhere, with just a few small spots blended to fix minor scratches. All the original sheet metal is still there, including the front fenders and valance. No rust, and you can still spot the factory pinch-weld blackout on the rockers and trunk drop-offs.1969 Ford Mustang Boss 429Richmond AuctionsBoss 429 guru Lyle Essick checked this one out and confirmed all the right numbers are in the right places – radiator-support buck tag, dash plate, and driver's door plate all match up. You'll still find original Kar Kraft chalk marks and the hood rotation number, 83, hanging around. The car keeps its Magnum wheels, oil cooler, air-cleaner snorkel, and a bunch of other original bits. There's even a pile of removed parts – distributor, fan, smog gear, power steering, shifter linkage, fuel pump, master cylinder – thrown in for good measure. Paperwork comes with, and the appraiser thinks the original build sheet might still be hiding under the carpet.1969 Ford Mustang Boss 429Richmond AuctionsThe OfferSpecificationDetailMakeFordModelMustang Boss 429 SportsRoofYear1969Chassis identifierKK1877Mileage13,670 original milesEngineBoss 429 V8; displacement not specified in the listingTransmissionFour-speed manualRear differential3.91 Traction-LokDrivetrainRear-wheel driveExterior colorBlack JadeInteriorDeluxe interiorNotable detailsFactory paint, original sheet metal, numbers-matching drivetrainAuthenticationReport by Boss 429 specialist Lyle EssickVehicle identification number9F02Z198841Interested in this Ford Mustang Boss 429? View the listing here.What Makes the Ford Mustang Boss 429 UniqueThe Boss 429 was born in the golden age of street and strip rivalry, when Detroit was out to prove a point. Ford needed a home for its 429-cubic-inch V8, so it stuffed it into the Mustang, creating one of the wildest, most specialized muscle cars of the era. The bulging bodywork, massive hood scoop, and mean stance make it stand out from the usual Mustang crowd. With so few built, it's no wonder collectors go nuts for these.1969 Ford Mustang Boss 429Richmond AuctionsWhat makes KK1877 special? It's all about the details. Original paint, matching drivetrain, Kar Kraft scribbles, and a stash of parts show exactly how this car rolled out of the factory. The authentication report is the cherry on top. For collectors who care about history as much as horsepower, this stuff matters just as much as how shiny the paint is.Final ThoughtsLow miles, original paint, numbers-matching drivetrain, and paperwork from a Boss 429 expert – this '69 Mustang has all the right ingredients. In a world where condition and history can make or break a sale, this one stands out. The $200,000 bid is under the market average, but we'll have to wait and see where the gavel lands.Thinking about making a move? Double-check the authentication report, go through the paperwork and parts, and get an independent inspection if you can. Make sure the car's condition matches the listing. If everything lines up, KK1877 could be a killer find for anyone after an unrestored, collectible late-'60s Mustang.Disclaimer: This post is for informational purposes only. We are not a dealership or broker. All vehicle specifications, pricing, and availability are subject to change without notice. We are not responsible for typographical errors, omissions, or the accuracy of the provided information. Please verify all details directly with the seller.