[['19th Commonwealth Parliamentary Conference', 'CARD_SET_REF', 'PHQ 3'], ['19th Commonwealth Parliamentary Conference', 'QTY._ISSUED', '15,200'], ['19th Commonwealth Parliamentary Conference', 'STAMP_ISSUE_DATE', '12 September 1973']]
15,200 cards with Car set PHQ 3 with stamp set 19th Commonwealth Parliamentary Conference were issued stamp 12 September 1973