China (PR), Hong Kong and Macau celebrated on September 7, 2023, the 10th anniversary of the Belt and road Initiative (BRI) with one stamp for China and a souvenir sheet each for the two other postal administrations. The Chinese stamps were issued in miniature sheets of 8 [4×2] or 12 [3×4] stamps with colored margins. As such this issue can be considered as a Dependency Parallel issue [PD]. Additionally, the three post offices created a booklet containing the two souvenir sheets and a miniature sheet of 4 Chinese stamps [2×2] with white margins. The Macau and Hong Kong souvenir sheets from this booklet have an additional white margin of about 6 mm on the left sign, and therefore can be differentiated from the original isolated souvenir sheets. The amount of 141,400 booklets was printed and redistributed to the different post offices. These booklets bear on the back cover a code number starting with the letter A, B or C, corresponding respectively to the Chinese, Hong Kong or Macau sales origin. Macau announced that they were attributed 15,000 samples but the allocation of the rest among China and Hong Kong is not known. With this booklet, this issue can be considered as Se-tenant and as such will be filed under the code [S20230907]. This is the 12th joint issue between these three postal administrations.