1991 Mazda MX-5 Miata Special Convertible

An absolute time-capsule car like this—a 1991 Mazda Miata Special Edition (SE) in British Racing Green (BRG) with only 660 original miles and a single owner—transcends normal car valuation. It is no longer priced as a driver; it is priced as an investment-grade museum piece. The current market value for this specific car sits in the $38,000 to $45,000 range, with the potential to push even higher toward $50,000 if it features the highly coveted matching OEM hardtop and full original documentation. The Market Breakdown While an excellent, driver-condition 1991 SE with 30k-50k miles typically trades between $14,000 and $18,000, ultra-low-mileage NA (first-generation) Miatas command a massive premium. Radwood-era Japanese classics have firmly established themselves in the high-end collector market, and the 1991 SE is particularly desirable because it was the first-ever limited production run for the Miata (limited to roughly 4,000 units), bringing unique British Racing Green paint, tan leather, a Nardi wood shift knob/handbrake, and stainless sill plates. Why It's Worth This Premium The "Time Capsule" Multiplier: In the collector world, a car with under 1,000 original miles acts as a baseline benchmark. Collectors pay heavily for the privilege of owning "the best surviving example in existence." One-Owner & 100% Original: Having zero modifications, original paint, original interior, and a single name on the historical title prevents any deductions for a checkered past. Critical Factors That Will Dictate the Final Number If you are looking to buy or sell this vehicle, a variance of $5,000 to $10,000 will hinge entirely on the following details: The Factory Hardtop: The 1991 SE could be ordered with a color-matched BRG removable hardtop. Having the original, pristine hardtop with the car easily adds $2,500 to $3,500 to the final hammer price. The Original Tires: At 660 miles, the car should still sit on its factory-issued Bridgestone SF-325 tires. While completely unsafe to drive on due to age, keeping these tires stored with the car is a massive point of pride for concours judging and collector value. Mechanical Care vs. "Barn Find" Neglect: Has the car been stored in a climate-controlled bubble, regularly started, and fluids cycled? Or has it sat stagnant? Even a 660-mile engine can suffer from dried-out main seals, a gummed-up fuel system, or deteriorated cooling hoses. A fully sorted, turn-key ultra-low-mile car brings top dollar; a non-running preservation project slips toward the lower end of the window. Documentation: To extract maximum value, you need the original window sticker, the original purchase invoice, the uninstalled Nardi gift items (if applicable), both keys, and the factory boot/tonneau covers in their original bags. Best Venue to Realize This Value To actually hit the upper limits of this valuation, the vehicle needs a national, enthusiast-driven audience. Selling it via a premium online auction platform like Bring a Trailer or Hagerty Marketplace is highly recommended over standard local listings. These venues cultivate bidding wars between high-net-worth collectors who are specifically hunting for flawless, single-digit-mileage legends.