The sale, Books and Works on Paper including Fine Photographs, comprises 470 lots and takes place at parent-company Stanley Gibbons home at 399 Strand, London.
Bloomsbury Auctions’ final sale takes place on Thursday.
It is the last sale for the auction house which is due to move out of its Maddox Street home at the end of the month.
Art consultancy and valuation firm Gurr Johns’ takeover of Dreweatts in October included the purchase of the Bloomsbury name but none of its staff or premises and all employees of the 34-year-old firm were served notice of pending redundancy at the time.
At the book auctioneer’s final sale an original fine black pen and ink miniature manuscript book by JK Rowling titled Hogwarts School of Witchcraft and Wizardry is expected to be among the top lots, with an estimate of £80,000-120,000. This manuscript containing Rowling's drawings and short extracts from Harry Potter and the Philosopher's Stone was created for the benefit of the charity The 999 Club and was auctioned by Sotheby's, November 1, 2004, when it sold for £11,000.
Another top price is expected for Johannes Blaeu’s Theatrum Orbis Terrarum, which has an estimate of £10,500-12,500, and a print of Steve McCurry’s 1984 Afghan Girl photograph is estimated at £2500-3500.