77-79 930 Black Book 12 month histories show a downtrend. '89 has faired better but that's the appeal of the last model year and the G50 gearbox.
Buyers in the run up have been looking for the door and no auction house is going to allow a high reserve on a '76-'89 Turbo.
That leaves BAT or eBay. I'd be holding for now.
