I've just taken this lovely S4000 in trade.
Very early 4000 serial number 058 ( 58th 4000 made?)
The guy i took it from said it bought it new ( no receipts sadly)
Red Mist
Black hardware
Original case
18v
Pretty much immaculate - couple of tiny scratches on underneath of lower bout - doesn't show.
Serial number would suggest 1989 production.
Everything work perfectly -no noises or crackles. - and it sounds .....absolutely superb.