Great news! I just received the university postcard of CUHK - City University of Hong Kong, Kowloon Tong, Kowloon. This completes my collection of Hong Kong universities that are in the world's top 200 ranked list.
The others that I have already collected are University of Hong Kong, Hong Kong University of Science and Technology and Chinese University of Hong Kong. Thanks to Kate of Hong Kong. Nice stamp of Queen Victoria used.