FO 6551802-1961Foreign Office: Chief Clerk's Department and Passport Office: Collection of Passports
This series contains a collection illustrating the many different types of passport issued. It includes some passports issued in the late eighteenth and early nineteenth centuries by Foreign Missions in this country to British subjects wishing to travel abroad. Up to 1898 the passports are in the form of single sheets folded in four: thereafter (until 1923, when the modern book form was introduced) in eight-page folded books.
The search register of passport applications for 1851-1856, 1858-1862 and 1874-1903 has been digitised by an external company unassociated with The National Archives and are searchable through their website.