In addition to that light blue Convertible…
…some other rare US Convertibles include the 714 (1967 or '68), promo 706 ('69-'71), and 1032 (early 70s, not sure of exact year). I also believe that there were some gold U4001s with a groovy bag pattern, and, since I own one like this myself, some U4089s apparently had the same groovy bag. Might anyone know how rare these actually are? I did see a photo of one some time ago on VL. Probably an old thread.