LONDON – A silk banner proclaiming the abolition of slavery in the British empire in 1834 forms part of an extraordinary single-owner collection for sale at Chiswick Auctions on Wednesday, January 18. The blue and gold silk banner that reads “August 1, 1834 Slavery in the British Dominions Utterly and for ever Abolished” has an estimate of £1,000-£2,000. Absentee and Internet live bidding will be available through LiveAuctioneers.