A second valuable item on display was the first official stamp commemorating the founding of the Republic, on which is depicted the emperor's place of discourse, issued in denominations of up to 25 Yuan. On the two-Yuan stamp, the postmark is inverted, making the 49 remaining specimens of this type collectors 'items.
「闢雍」是為皇帝講學的地方，也稱為「學宮」，所以這枚郵票通稱為「宮門票」，面值有一元、二元、五元、十元、二十元五種，其中面值二元的一種，出現中心宮門圖樣倒印，即俗稱「宮門倒」，現存據說只有四十九枚。