Any person who shall have been continuously in full time employment in the service of the Municipality for a period of one (1) year, or more, prior to the approval of this Charter, shall be retained in the same or similar position without examination; except that such persons shall be required to submit to a physical examination given by a physician designated and paid by the Municipality, the results of which shall be filed with the Commission for record purposes only. Such persons shall otherwise be subject to all regulations and rules of the Civil Service Commission. The Commission shall provide by rule for the ascertainment of merit and fitness as a basis for an appointment and promotion in the service of the Municipality. The Commission shall determine the practicability of competitive examination for any non-elective office of job classification in the Service of the Municipality, and for appeals from the action of the Mayor or any Director in any case of transfer, reduction or removal.