Using this site... http://www.mbclub.ru/mb/vin/index.html?lng=eng

I came up with a few of option codes that I don't understand. Anyone have these or know what they mean?

524 paintcoat preservation (с 01.01.1964)
- is this clearcoat?

639 elimination of first-aid box and warning triangle (с 01.08.1977)
- I still have my first-aid kit in the back window. Where would the triangle normally be? It was an option to not have them?

801 Change of year of model, last figure shows new model year
This sounds odd all together. What does this mean?

Thanks in advance.