"Postbücheln" were small booklets produced from the mid-1800s onwards, initially at the expense of the postmen, latterly with advertising. They contained essays, jokes, helpful information on postal rates and services, etc. They were handed out (usually around Christmas) by the various types of postman (letter delivery, packet delivery, ...) to customers in the expectation of a tip. Some at least of the funds raised were handed to the Postal Workers Welfare, Widows and Orphans Fund. In an extensive collection of over 100 of these boooklets, only two were found with any reference to the pneumatic service! The cover and two contents pages of an 1887 booklet follow; the other one is from 1937 and is in the Railway Station Letters section.