Is the Hong Kong Calligraphers Association reliable?

Reliable. According to public comments, China Calligraphers Association was established in September 1992, which is a formal and officially certified association. Hong Kong (HK), the full name of People's Republic of China (PRC) Special Administrative Region, is located in the south of China, bordering the Pearl River Estuary in the east, China and Macau across the sea in the west, Shenzhen in the north and Wanshan Islands in Zhuhai in the south. Its regional scope includes Hong Kong Island, Kowloon, New Territories and 262 surrounding islands.