I know this will be speculative also, but how about some experienced guesstimations
76 targa, steel 930 conversion, 3.0litre, updated to late 80's look, driver and passenger side power seats, no cracks on dash, no tears etc., top is in excellent condition, no smoke on start up or driving, alpine cd player, pearl white on black, no door dings or scratches, (paint may be a year old) everything works but the clock, drives and stops straight, could retint the back window, maybe put in new carpet, not torn just would look more fresh, not much history on the car, from a business that rents cars to movie studios.no airconditioning, 137k A titled car. Any guestimates. I can send some pics but one is too large a file, and the others are poor quality, but it is an excellent looker.