At such time as the Municipality shall become a city, Council shall and prior to that time, may, by ordinance provide for and establish a Civil Service Commission and a civil service system. The Commission shall consist of three (3) electors of the Municipality not holding other municipal office or employment, to be appointed for terms of six (6) years, or removed by the Mayor subject to confirmation by the affirmative vote of two-thirds (2/3) of the members elected or appointed to Council, except that the three (3) original members shall be appointed for a term expiring on the last day of December of the second, fourth and sixth years after their respective appointments.
   All members of the Commission shall serve without compensation unless otherwise provided by ordinance of Council.
   A vacancy occurring during the term of any member shall be filled for the unexpired term in the manner authorized for an original appointment.