you talking about thw color named "bright red", color code 609? dont know about the US, but here in Europe, only 850Rs were given that color from the factory, wasnt even possible to order a 850 lower in the engine/equip chain in that color. here it makes them pretty rare, atleast the original ones. in Norway I guesstimate about 25 original ones remain, a sizeable part of whom is privately imported. probably more frequent in the US though, maybe not regarded as a collectors limited edition on the same level as here either.
just beware, I have a 601 Signal Red 854, and keeping a red car clean and shiny us a proper bitch. any swirls stand out, way more than on any black or white car. and none of them are metallic or clearcoated, just the red base color. when you do get it shiny, tho, you'll be religious man. a properly shined up red car is simply beautiful.