A convertible is generally a car that has provision to 'convert' it from a closed car to an open car by putting the top down.

I noticed while looking at some of the old cars that they are not really convertibles because they have no top at all. Should we continue to list these open cars as convertibles?

examples are:

http://www.imcdb.org/vehicle_49307-Whitney-1900.html
http://www.imcdb.org/vehicle_20470-Stanley-EX.html
http://www.imcdb.org/vehicle_11847-Stutz-Bearcat-1914.html