The fonds consists of a bound manuscript, 234 pages in length, containing prayers appropriate for different occasions, times of day, Sabbath prayers, and so on. There is an index on the inside front and back covers. Also written on the inside cover is: This book of devotions in the handwriting of Oswald Mosley, Esq. (father of the first Sir Oswald) who died A.D. 1726 in the 87th year of his age. Oswald Mosley." The book had been started by at least 1707, which appears on one of the end papers, but the precise date, other than completion before the end of Oswald's life, is unknown.
Pasted on the inside front cover is a bookplate containing the Mosley family coat of arms, with the family motto "Mos Legem Regit" followed by "Sir Oswald Mosley Bart., Rolleston House". Stamped on spine is "Prayers Mss."