You can still "avoid substitutes," as the line of small print advises: Although the bakery's founder sold his business in 1921, Butternut Bread is available to this day. Under the ownership of Interstate Bakeries, the Schulze name remained in use at least until 1957; the most charming Butternut promotions appeared a decade later, courtesy of a different Schulz.
Schulze's Butter Nut Bread
Surviving signage, 2024 West 18th St. (South Hoyne-South Damen Aves.), Chicago
(From a June 2016 visit)