Interesting shot that I'd date at 1954 - the year the East Wing of the central government offices was built. The Central Wing wasn't completed until 1956, and the West Wing was finished in 1959. (dates from historical appraisal of the CGO)
http://www.heritage.gov.hk/en/doc/conserve/ExecutiveSummary.pdf
Source: This image came from Flickr, see https://flickr.com/photo.gne?id=5466916458
Date picture taken
1954
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