Letts Quickref Diaries
160 Shaftesbury Avenue, London
1885 Letts, Son and Co was put into liquidation; the copyright to the diaries was sold to Cassell and Co, who formed Letts' Diaries Co Ltd with Hazell, Watson and Viney
Letts' Diaries Co Ltd later became Letts Quickref Diaries
Hazell, Watson and Viney later took a controlling interest[1]
1945 Hazell, Watson and Viney sold Letts Quickref Diaries to Charles Letts and Co and at the same time took a financial interest in that business; all Letts diaries would henceforth be produced by the Charles Letts Co[2]