I have an interest in Walter Clutterbuck and wondered if we could exchange information? I was very interested to see your note about his having gone to Hong Kong. I know that he was from an aristocratic English family and travelled the world taking photographs. He was in Japan and Okinawa for at least the months of December 1898 and January 1899. He wrote, or co-wrote 3 books: you can see them listed on any used books search site - e.g www.usedbooksearch.co.uk
I know that he was born in 1853 and died in 1937. That's all I have. Do you have anything more?