Mark -
It seems that 1980 70-series model is significant for both of us.
In February 1981, my mother's 1974 Kenmore 60 series machine, which was essentially identical to this model features-wise (it had an infinite water level but a Penta-Vane agitator) had a premature failure in the basket drive, which we were told required a whole new one, at less than 7 years old. The repair bill was going to be 200-some dollars, and my Mom wisely balked at that.
I went with her to Sears, and we bought this very model, the 20721, for about 100 bucks more than the repair estimate. I was excited about getting a new machine, but not happy about loosing the '74. I remembered how excited I was when we got the '74, until I saw our 1961 70 going off on its side in the back of an old Dodge pickup. I said to myself "not again" and set out to fenagle a way to get the '74 fixed, without the cost.
Turned out I could buy the recommended basket drive at a decent discount at the Sears parts warehouse. I think it was $60 maybe $70 dollars. They were willing to show us how to put it in using some of the machines that were there for in-house service. They sold us a DIY repair manual, and said we could return the basket drive in the event of a botched job, or they'd finish the work at a reduced labor rate if we had the machine already taken apart or spewed all over the laundry room. Somehow my folks agreed with my logic and we went for it. It saved the '74 from an early departure, and we canceled the 20721, much to the displeasure of the salesman. It took us two hours or more on the back porch in a driving Colorado snow storm, but I can still remember the absolute glee when re-installing the '74 and it going into its first spin. The feeling of success, and saving a machine, and my parents over $200! It was a prelude to a lot of future washer work.
I always wanted that 20721 model ever since we cancelled it, and oddly enough, Mom bought a 21721, which is the 1981 equivalent, in December 1982 when we got transferred to Charlotte and bought a new pair. I found a home with some friends for our '74 which lasted until 1999 at least.
Earlier this summer I acquired a 20721 machine. I've never seen that many of them. The two lesser 1980 70-series models are much more common (the five cycle, four level machines). Can't wait to restore it...maybe it can be yours one day Mark!
Gordon
By the way - if you look closely in the catalog ad above, it says this machine has a porcelain lid, but an enamel top. This I believe was in the spring/summer 1980 catalog? I never liked those enameled parts much, they rust too easily on the east coast. By the Spring/Summer 1981 catalog, it had both the porcelain lid and the porcelain top. Sears must have re-aligned things a bit.