Code BJ used in Fungshan PO by Variosyst 503b machine.
Code AS used in Kaohsiung Xinsin PO by Variosyst 503b machine.
Code AM used in Zhongli post office by Variosyst 503b machine.
Code AN used in Zhongli post office by Variosyst 503b machine.
Code AO used in Taipei main post office by Variosyst 503b machine.
Code AP used in Taipei main post office by Nagler machine.
A special overprinted red color control code on left bottom side.
