The 250 SL was a short lived version of the Mercedes Pagoda Top cars produced between the end of 1966 (after the 230 SL) and the beginning of 1968 (before the 280 SL). This one is described to have some rust issues in the undercarriage but still sports its original paint. It includes both tops and has recently received 11K in mechanical repairs.
The seller is trying to temper prospective buyer’s expectations saying the mostly original paint does not look as good in person as in the pictures. Personal experience does confirm this as a rule of thumb, but hopefully the paint is presentable enough that the next owner preserves it instead of painting it. Find it here on eBay with a Buy-it-Now price of $18,495.