Yes, sorry, wrong expression. Thank you for pointing.
Yes, it was often about soft top color, but not always.
On my datacard I have wenig gewunscht 249 and 836, where
249: from 01.02.1966 to 30.06.1972 ” REAR WINDOW, ELECTRICALLY HEATED (HEAT-INSULATING GLASS)
836: from 01.08.1962 to 30.09.1970 FIRE EXTINGUISHER
For 740 we have: from 01.08.1972 TOILE DE CAPOTE 9001 BLACK
We do not have its interpretation for the 60ies, that is why I think it may not be about black soft top.