A miniature Roman Catholic prayer book titled The Pocket Key of Heaven: A Manual of Prayers. The book is bound in cream-coloured celluloid covers with a brown cloth spine. The front cover features an applied silver-toned metal monogram consisting of the letters AM in a decorative scrolling script topped with a floral wreath. The volume is secured with a hinged metal clasp featuring an openwork trefoil design. The title page identifies the publisher as Fr. Pustet, Printer to the Holy See and the S. Congregation of Rites, New York and Cincinnati. The interior includes a wood-engraved frontispiece of the Crucifixion and contains various liturgical texts, including the Mass for the Dead. Height: 2.5 inches Width: 1.75 inches Depth: 0.75 inches.