This photo of a junk seems to be the bottom half of a coloured-in version of the Sternberg postcard shown at https://gwulo.com/media/49407
The upper photo of a Chinese amah and family leading two dressed up European children down Pottinger Street is not shown.
It is published in "Old Pictures of Hong Kong" (2010) in the section on Vessels and Wharves.
Date picture taken
unknown