This is a Photo Post Card on Kodak Paper. Facts about the City of Paris 1951 Christmas Tree are printed on the back of the postcard:
Measures more tha 50 feet high, erected as it comes from the forest. Adorned with 4000 ornaments and more than 2000 lights. Tree selected trained woodsmen weeks in advance…flame-proofed upon arrival in the city. Street roped off, doors removed to allow its entry late at night. Scaffolding with cat-walks allows even trimming by acrew of 30 men who worked 18 hours to make it ready for unveiling. Christmas 1951, the 51st tree, is the store's 101st year.
Department store Christmas trees used to be a big attraction for holiday shoppers. Some other stores that issued postcards showing their giant Christmas trees were Sterling Linder Davis of Cleveland and Barker Bros. of Los Angeles.