Nice advertising piece. Apparently the Shredded Wheat Factory in Niagara Falls, NY was the subject of several similar cards as shown in these images I found on the internet. I suspect the cards are pre-December 1928 as that is when the Nabisco name started to be carried on the product:

Excerpt from Wiki:
Quote:
The Natural Food Company was based at Niagara Falls, NY in 1901. It became the Shredded Wheat Company in 1904. It was bought by Nabisco (National Biscuit Company) in December 1928. US production moved to Naperville in Illinois in 1954, where it is still made. In 1993, Nabisco sold the brand to Kraft General Foods, but it was still under the Nabisco name until 1999, whereupon it was given by the phrase "Nabisco brought to you by Post". Canadian production has been at Niagara Falls, Ontario, since 1904 due to nearby hydro-electric power. US production is also at Niagara Falls, Ontario. Until recently, US production took place in Niagara Falls, New York, but that factory was closed to consolidate the two factories.