CLASSIFIED POSTAL SERVICE, SPECIAL RULE NO. I.
In addition to the exceptions from examination in the classified postal service made by Postal Rule II, clause 5, the following exception to examination in that service is hereby made:
Printers, employed as such.
Provided , That before any person may be employed under this exception to examination the Post-Office Department shall inform the Commission of the authority given to employ printers at any post-office and of the number authorized to be employed at such office.
Grover Cleveland, Executive Order Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/205468