Superior Life

This sewing packet is probably from the late 1940s or the 1950s—

City postal zones, as listed on the inside cover, were used from 1943 until the early 1960s—

Those dates are from this USPS history [pdf, page 34]:

During World War II, thousands of experienced postal employees left to serve with the military. To offset the loss, in May 1943 the Post Office Department began a zoning address system in 124 of the largest cities. Under this system, delivery units or zones were identified by one or two numbers between the city and state — for example, Birmingham 7, Alabama — so that mail could be separated by employees who did not have detailed scheme knowledge.

Twenty years later, the Department implemented an even farther reaching plan, the Zoning Improvement Plan (ZIP) Code.

Also inside the packet, a post-war import—

Printed on left of red vertical border: "Made in Germany."

So, sometime in the years between the end of the war and the introduction of ZIP codes, Superior Life was advertising its solvency, as reflected by plentiful offices and assets.

If the company (and its assets) lasted to the 1980s, I assume it was swallowed up at some point after that—probably by some outfit that was in turn swallowed by successive other outfits. Any surviving entity may have been re-branded during all the mergers, acquisitions, and ponzi schemes since then... Perhaps a business history researcher (not me), could learn when and why the Superior name disappeared.

But there you have it, in our superior system.