ND Phot
The French photographers, Neurdein Freres, or La Maison Neurdein, came to Canada from Paris in the early 20th century and created an extensive collection of images that they then made into postcards.
The sons of photographer Jean César Adolphe Neurdein, (born on March 26, 1806, died on March 27, 1867) were Étienne (December 3, 1832 - February 27, 1918) and Louis Antonin (1846-1914), member of the French Society of Photography in 1884.
Following their visit in 1907, a total of 57 ND Phot postcards were issued of Toronto scenes, according to Yves Beauregard in his Repertoire des cartes postales de la Maison Neurdein, Québec et Ontario. published by Club des cartophiles québécois in 2009. Below are a couple of examples.
Their company merged in 1922 with "LL" (Léon & Lévy) and took the name "Lévy and Neurdein together".
Below, examples of postcard backs from this publisher.