The British Postmark Society (BPS) was founded on 1st January 1958, and exists to promote and to co-ordinate the study and collection of British postal markings, particularly of the 20th century and subsequently, and to publish and disseminate the results of our studies. Our members’ interests include hand and machine datestamps, slogan and special event postmarks, explanatory and instructional labels and markings, Post Office postage labels, Royal Mail SmartStamps and Online Postage indicia, and printed postage impressions of Royal Mail and other licensed postal operators.