The 1968 Dodge Coronet R/T convertible is extremely rare. Exact production numbers are debated, but it's generally accepted that
very few were made, likely under 1,000 total. This makes them among the rarest muscle cars from that era. Their rarity is driven by several factors: the already low production of the Coronet R/T, combined with the even lower popularity (at the time) and therefore lower production of convertibles, compounded by the high attrition rate over the decades due to rust, accidents, and parts availability issues.
So, while a precise number is impossible to definitively state, finding one is a significant event for any collector.