This is the kind of machines thet were sold in South america time ago, mostly in Argentina you can find alot of machines like that around in there.
Personally, I don't think these machines provides a good washing, anyway, even here in Italy there were some machines running on the same principle, some of these were  Zerowatt and Castor, I'll post videos later-

Here is a type of this machine on the "mercadolibre" Argentina that is a kind of South American ebay:

Another:

3

4

Countless in Argentina and some in  South america countries nearby.

The italian Zerowatt:

Castor:

In Italy these machines never catched up because they had the fame to do not provide good washing results so they were abandoned very early.

Anyway returning to the lavinias, I always thought lavinia brazilian  machines were made by westinghouse, do not think westinghouse made that one....

Another westinghouse lavinia:

Hell how I dislike those indexing tubs! They would have been better without!

About this machine.  The video is from Brasil and the machine is cold fill only.  Although I do belive it was made in Argentina.  Most people there do not do hot washes.  The ground water can be as warm as 30-35C so it is warm enough for the detergents to work well.  Unlike here in Minnesota where the water temp is around 3-5C right now. 

WK78

Most peole there didn't have water heaters in the past, as told having water actually warmed by the hot weather for most of the people that was enough, for this reason historically there was not the use of having  heaters for current hot water over there, so most of the machines were not provided with  hot fill, even most of the old Brastemp (whirlpool made) had only cold fill, in some istances machines were connected  for the moment or manually filled for hot washes thanks to small  gas  insta-water  heaters on purpose near the laundry area as told by my Brazilian Friend Rita, but  some models of Brastemp had either  hot and cold fill (TOL models) owned by ones having central  hot water available of course.
In modern days there're more people owining a water heater so many modern brazilian machines does have hot and cold fill, some models have also an internal heater.

Found a Brastemp thread just to see: