Photo source: ETH Library Zurich, Image Archive / Com_LC0143-003-007 (CC BY-SA 4.0)
Original title: Hong Kong, Wan Chai. Taken by Comet Photo AG (Zürich). Dating 1967-1971.
Arsenal Street Flyover completed in 1970 is spotted. The progress of the construction site at the former Hua Nan Motors in front of the building with Coca-Cola advertisement also suggest this photo was taken on or before 1971.
The double headed HYF ferry was likely Man Tim (民添) [1961-1999] or sister ship Man Kam (民錦) [1959-1991].
Reference:
Traffic Flow on Elevated Road Bridges Completed for 35 Years or Over: https://www.tlb.gov.hk/eng/psp/pressreleases/transport/land/2008/200803122.htm
The Hong Kong & Yaumati Ferry Co. Ltd. Golden Jubilee 1923-1973, p.5 & p.19
https://www.hkf.com/static/links/ann/50th.pdf