(a) A clerk, upon any test of fitness determined upon by the
  nominating officer, to any vacant place in the class next above the one
  in which he may be serving.

  (b) A day inspector, upon any test of fitness determined upon by
  the nominating officer, to class 2 in the grade of clerk.

  (c) A clerk, day inspector, opener and packer, or sampler, after
  passing the examiner examination, to the grade of examiner.

  (d) A messenger, after passing the clerk examination, to the
  lowest class in the grade of clerk.

  (e) A night inspector, after passing the day-inspector
  examination, to the grade of day inspector.

  2.  Other promotions may be made, in the discretion of the promoting
  officer, upon any test of fitness determined upon by him.

  CUSTOMS RULE VI.

  1.  Transfers may be made as follows: 

  (a) From one office of a classified district to another office in
  the same district, subject to the provisions of Customs Rule V.

  (b) From one classified district to another, upon requisition by
  the Secretary of the Treasury.

(c) From any bureau of the Treasury Department in which business relating to customs is transacted to any classified customs district, and from any such district to any such bureau, upon requisition by the Secretary of the Treasury.

2.  No person may be transferred as herein authorized until the board of examiners, acting under (a) of clause I, or until the Commission, acting under (b) or (c) of clause i of this rule, shall have certified to the officer making the transfer requisition that the person whom it is proposed to transfer has passed an examination to test fitness for the place to which he is to be transferred, and that such person has been at least six months preceding the date of the certificate in the classified service of the Department or customs district from which the transfer is to be made.

  CUSTOMS RULE VII.

Upon requisition of a nominating officer in any customs district the board of examiners thereof shall certify for reinstatement in any office under his jurisdiction, in a grade requiring no higher examination than the one in which he was formerly employed, any person who within one year next preceding the date of the requisition has, through no delinquency or misconduct, been separated from the classified service of said office.

  CUSTOMS RULE VIII.

  Each nominating officer of a classified customs district shall report to
  the board of examiners—­

  (a) Every probational and absolute appointment, and every
  appointment under any exception to examination authorized by Customs
  Rule II, clause 5, made within his jurisdiction.