Measurements:  4 5/8" X 3 1/2" (11.75 cm x 8.89 cm).  There is "gum" on the front of the label, so maybe you were supposed to stick this on the inside of your rental car window?  Who knows.  On verso:  A SERVICE FOR TOURISTS.  Visitors to Great Britain are invited to make full use of the reception and information facilities provide at the Tourist Information Centre of the British Travel & Holidays Association, Queens House, 64-65 St. James St., London, S.W.1.  Conveniently situated in the heart of London, the Centre offers the services  of a fully qualified information and reception staff, equipped to answer enquiries in many languages.  LOVE, LOVE the Union Jack design!  Overall condition is very good.