The ashtray lid was always covered with a thinner MB-Tex (vinyl) foil. The regular MB-Tex or leather material was too thick. Many have changed the material later, but if leather is chosen, thin leather ("Spaltleder") should be used.
All 230SL up to VIN 113042-..-012466, resp. August 6, 1965, had black ashtray lid inserts, regardless of upholstery color. This is also the case with the inserts in the window crank levers. From there on, the color matched the upholstery.
Source: postings on pagodentreff.de