Sorry, maybe I am missing something but that still does not make sense to me. You have "listed" several cars this way. As the broker, you already provide privacy for the seller. Describing the car does not remove the privacy for the seller except maybe to a very few who know the specific car and thus the owner. However, they likely already know the owner is selling it. So again why the mystery? RB
The number of Iso Grifo cars is small so a specific car for sale does identify the seller to many in the Iso community just the same as in the Ferrari community and other low volume production cars. The seller wants to sell the car without all the publicity of identifying the car (and thus the seller). It makes perfect sense and is not something I invented but is common in the classic car world.