The bus model in above picture was the KMB Commer 金馬 1934-1965 model. It was used as KMB 15A mainly running in the New Territories in the 1950s. According to 1955 年香港年鑑, 15A served the route Jordan road-Prince Edward rd - Nathan rd - Tai Po rd - sheung shui
https://www1.kmb.hk/tc/club/playground_museum_1f.html
Date picture taken
unknown