A postcard showing the artifact, a clock (铜镀金仙鹤时乐钟), in the Museum of Nanjing (南京博物馆). Thanks Yvonne.
A 3 Yuan petroleum theme stamp (2013-2, 3-3) was used together with a pair of 80 Fen rose personalized stamps. They were cancelled first with a machine cancellation of Nanjing Guanghuamen 2 (南京 光华门2) and then a single postmark of Nanjing Guanghuamen 8 (南京 光华门8) on the flower stamps. Both cancelled on 22.8.2014.