WW1 Religious Tract Society RTS Fund flag day badge

A scarce original First World War period fundraising double sided paper flag day badge', depicting a book bearing the letters 'RTS Fund' inscribed: 'TO CHEER THEM UP AND HELP THEM ON'. 'GOOD READING FOR OUR SOLDIERS AND SAILORS'. 'THIS FUND SUPPLIES FREE, BOOKS, MAGAZINES AND BOOKLETS TO OUR SAILORS AND SOLDIERS IN TRENCH, CAMP AND HOSPITAL, CREWS OF MINE SWEEPERS, HOSPITAL SHIPS, OUR ALLIES, PRISIONERS OF WAR, ETC'. 65 St. Pauls Churchyard, London E.C. Very good condition, complete with pin. Width 42mm.