This is a vintage reprint postcard; to be actual, a photograph-made postcard.
Wyndham Street, looking from Queen's Road. Probably around the early 20th century.
The vicinity of Wyndham Street was the "high-class" brothel area, where one could find only European but no Chinese girls. Visitors used to bring along with a bunch of flower; therefore, there was a flower market there.
Not far from Wyndham Street is Lyndhurst Terrace; its Chinese name, 擺花街 or "flower arranging street", also tells the presence of a flower market in the past.
Wyndham Street, c.1930-1940, still a flower market.
Today's Wyndham Street.
Visit Shinta's website for her enormous collection of market postcards.