I'd bet that your machine:

...began its career looking like the drawing below. Granny had the 1963 version of this same model (looked almost identical but where this one is blue, hers was gray), and like hers, this machine differs from the base model in that it's missing a rinse temperature selector, and the pedestals:

We used Salvo too, because our old usual detergent, Fab, oversudsed the machine. I can still remember the clang sounds as the tablets hit the bottom of the empty tub. We also used something called "Action Bleach" that came in little dissolving cellulose packets ( must have given the Colombian drug cartels a horrible idea). Short lived, I think because if you threw them into the washer with the clothes a portion of the laundry got a damaging dose of concentrated chlorine bleach before it was distributed throughout the tub. It's amazing how all these laundry additives have their own story of evolution. Nowadays there's almost nothing but liquid detergent in the supermarkets. I think 99% of Americans use nothing but that and there's maybe 1% of us nut-cases who use all the other stuff.