text: 1 April 2017 Last updated at 12:33 BST
  The tiny pad was appraised by manuscripts specialist Matthew Haley during an episode filmed at Caversham Park in Berkshire.
  The programme will air on Sunday at 20:00 BST on BBC One.
target: A 17th Century notebook analysing the work of William Shakespeare has been described as "extraordinary" by an Antiques Roadshow expert.