Lot 2879

1950 Chengfu (12 Jan) to USA, f.w. North China People's Post Tiananmen $500 x3, tied by Chengfu cds. Unified national postage was effective since 10 Jan 1950 and the correct international letter rate was $1800. This cover was still paying $1500 old rate. And airmail service was not resumed until 1 Feb.

1950.1.12 成府寄美國，貼華北人民郵政天安門圖500元x3，銷成府三格英漢日戳。全國統一郵資於1月10日生效，國外信函郵資為1800元，但此封貼仍貼舊郵資1500元。雖然使用航空封，但空郵服務要到2月1日才恢復。