Update 2022-06-13 (see comment below)
Quite likely early 1960's. The map shows the Stewart Road Ferry Pier (Wanchai to Yaumati Wharf) that was closed at the end of 1970.
The map is pretty over-simpified, but you surely will find the bar..
Source: This image came from Flickr, see https://flickr.com/photo.gne?id=13232118423
Date picture taken
1962 (year is approximate)
Gallery
Shows place(s)
Comments
piers on gloucester road
The harbour was reclaimed there and a new pier opened on reclaimed land in 1968. As the map shows only the old coastline, it cannot be later than 1968. As the Tonnochy pier also served Hunghom after 1963 in addition to Kowloon city, the map is valid between 1956 and 1963. The Stewart pier was built in 1956. "Suzie Wong" only became famous after the film "The World of Suzie Wong" came out in 1960. A good guess therefore it is between 1960 and 1963.