I think this issue is like the chicken and the egg... Where do we place the 1918 Dodge convertible coupe (actual name) that was what I consider to be the first 2 door hardtop convertible. Removeable "B" pillar and windows that either wind down or slide down (rears). Leaving what is more commonly called a convertible hardtop coupe. For the necessary Imperial content -- The first Imperial 2-dr hardtop is 1951. Sherwood Kahlenberg