Reverse: "Stephen K. Shao, graduate of the Nanking Conservatory of Music, Director of the China Sacred Music School, the inspiration and back bone of the HK Music Training Centre for the blind. He gives his full time gratis."
Our guess is that Mr. Shao (Shao Kuang) is the same person appearing in #43, 151 and 408 (Shanghai), where his "English" name was "David K. Shao. His associations in Shanghai were in Nanking. He, Rev. Leland Wang, and others left China for Hong Kong when the PRC was declared in 1949.