Ted,
I may be mistaken, but I believe you should be able to find the 4-digit code for your interior on your Data Card. My leather is 219, but my interior code is 1098 which indicates the color of the carpet, floor mats, and possibly the 219 leather itself. I can't recall what all is indicated by the 4-digit interior code. Get that, and you will have your "originality question" answered.
Rodd
Powell, Ohio, USA
1966 230SL, Euro, Auto, Leather, both tops
1994 E420