Owners insist overall condition and presentation set the price, and the rule of thumb is to always pay a premium for the best example. Top sorted 6.3s and 300SEL 4.5s have cracked $90k-$100k (the recorded W108 4.5 high being $100,108), yet many commenters feel these hand-built cars still lag their true worth relative to comparable-era exotics, with some seeing a price rebound counter to published guide values.
Values: condition and provenance over everything, with a rising floor
Mercedes-Benz 250S-300SEL 6.3 (W108/W109) · market