Question: when was the first pakistani postal stamp issued
[{'answer': '1 October 1947', 'provenance': [{'wikipedia_id': '14477322', 'title': 'Postage stamps and postal history of Pakistan', 'start_paragraph_id': 6, 'start_character': 3, 'end_paragraph_id': 6, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::History.:1947 to 1971.\n'}]}, {'provenance': [{'wikipedia_id': '14477322', 'title': 'Postage stamps and postal history of Pakistan', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 617, 'bleu_score': 0.6742456438686231, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15697562495772817304}, 'section': 'Section::::History.:1947 to 1971.\n'}]}]