This photo wrapper contained several photos made by Willem Kien, in Hong Kong in the 1930s. As director of Holland-China Trading Company, he had been working in Hong Kong in the late 1890s to 1910s and visited the China East coast from time to time in the 1930s.
Modern Photo Supplies Co. was located at Queen's Road Central, in or near Queen's Theatre Building in Hong Kong.
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Courtesy Kien family archives