1979 Mercury Grand Marquis Value

Driver-quality cars with paint, trim, or mechanical work needed. 25th percentile of comparable asking prices: what survivors with deferred maintenance are listed for.

Solid driver-condition examples with documented maintenance. The middle of the market, where most cars are priced.

Concours-quality, numbers-matching, documented provenance. 75th percentile: what well-sorted, restored examples are listed for.