The Dragon Seed Company [1966-2008]
I am not sure about the 1950's, but from my childhood in the 1960's, the construction site shown in the photo below was where the Dragon Seen Company located. That's the corner of Li Yuen Street East and Queen's Road Central. The construction site caused a mud slide last year, made a few of those pai dong in ruin. I remember somebody fell into the hole....... but was soon rescued.