Can't duplicate the appearance by searching 'model R', but generally dates to the mid 30s. Suction cup agitator goes up and down, possibly around as well. The part not shown is the spinner.
Looks like jewelry or art, doesn't it? This is actually available? Is it said to operate? Failed parts would almost certainly have to be fabricated, quite expensive.
Restored to original operation and with modern detergents this machine would work quite well. Bearing in mind it is manual, the operator pretty much has to stand there the whole time manipulating clothes, levers and hoses.