Charles -
Back in the 60's there wasn't a great big gradient in price between one model and the next - maybe $5 or $10 each step-up, etc. The reason for that is that 10-bucks bought a lot more than it does today. There is more markup in a TOL machine by far than a BOL, but if yours started at $120, then a Lady probably wasn't more than $250 or $275 or so, with all the bells and whistles.
As to the receipt I have for the '61 - remember that there was 6 or 7 years of rising prices in between 1961 and 1967, and there isn't a great deal of cost difference (I mean manufacturing cost) between a 70 series and a 600. A three level pressure switch and an infinite one cost the same to make, so the differences between the two would lead to a simlar base cost but a larger profit margin for Sears on the higher priced unit. Also, it is important to note that while many of us bought machines on sale for $60, $70, even $100 off, some other people may not if the model they wanted wasn't on sale, etc. I have a 1967 catalog, I should just check, but those prices are relative because they don't include freight, and are not sale prices either. My '86 is in the catalog for $449, but I purchased it for $358 delivered.
Randy -
The Kenmores were fairly consistent in everything but the TOL models throughout most of the 60s. Styling changed year to year almost, but the specs and features generally didn't. So this machine other than the water temps, is essentially identical mechanically to yours. I wish they had the more colorful consoles of the early 60s, but I guess that gives the 61, 62, and 63 models their charm today.
Gordon