That's great information Dave.
These tubs were quite common in the Midwest in my experience. In the 70s,80s,90s it was quite common to have a laundry room with this sink.
My aunt had an avocado one with a Sears label on in it in her 72 built ranch home. My parents had an almond one in their 85 built home. A family friend had a pink one with awkward green tub in her late 50s/early 60s build tri-level. I had a white one in the first home I built in 91.
I've seen countless numbers of these in all the new built homes I toured in the Chicago/Milwaukee metro region back then. I wish I had pictures and all the brochures I picked up. I just took it for granted they'd always be there.