Phil
Not too sure, probably reckon anywhere between £2500 - £3500 depnding on how good / bad nick its in. Just a guestimate, sure some of the other 851 / 888 bunch will be along soon to give pointers. Recall there have been a few guys on the board bought similar bikes in last year or so.
I paid £4k for my '92 888 about 18 months ago from a dealer in pretty much immaculate condition having had recent engine strip & rebuild.
Of all bikes I've had this ones a keeper,
Alan...