It wouldn't be a censored cover, as it is domestic (within the US).
The fact that it has a precanceled Chicago, IL stamp would preclude the need for any other postal markings (i.e. postmarks, etc.).
The return address is from Straus & Schram which was a Department Store/Mail Order House in the early 20th century, apparently bought out by Spiegel in pre-WWII days, based on this notation:
Quote:
Straus and Schram was in business in the early 1900s.
According to a 1930's copy of the catalog, "Spiegel has recently bought out Straus and Schram's mail order business inventory completely." (I recall seeing a catalog dated 1942, perhaps it was issued by Spiegel.)
The above reference was taken from this link with sample catalog covers:
http://schram.net/lib/straus_schram_winter_1914/