Fader by Penny & Giles Studio Equipment. type : non motorised with screen printed front faceplate and amber light (overload ?) . Package markings: ( see photo) : PGF: 3622 Batch 03/91 spec: D23179/2 Looks like a twin pot due to no. of wires. ( 2 x Y/R/B ) reading 4.9K and 4.7K Ohm respecively so probably 4.7K nominal. Status: New Old Stock, came in with a load of new Studer parts. From a company that modified studio equipment for the BBC. possibly o.e part that was removed, or a modified add on. Studer Model : unknown, help appreciated ! *** many other studer parts nd boards available but not listed.... please enquire ***