Why pay for this photo? It's from the public domain on the Bibliothèque et archives nationales du Québec. This ebayer just made a copy in high resolution of this pic like I did 4 years ago... and sold it printed on Ebay. ! Thief?
"Campagne de sensibilisation dans le cadre de la semaine de la sécurité dans les transports, au Square Phillips à Montréal / Edmond Mount . - 1957 " Picture taken corner of Sainte-Catherine street, Montreal.. Trees are bigger but nothing changed. The building on the background is still a Hudson's bay Co store.
I also think the car is from John Little, maybe their sculpted drapes/curtains on this carved have a distinctive pattern? Note that a Quebec white coach in 1957 is a child hearse. They also removed the top ornament for the speed kills ad.
here is a shot the same day, with another hearse owned by Dallaire.