Tumble Heat
It does look like a 1970s model as it seems to have just the single control, I have an earlier version with two controls one for heat and one for time. The vent at the bottom front is so that it can be used as a heater (I jest not!). These have cropped up a few times over the years and if you are interested it might be worth speculating a few quid but not a fortune.
ActuAlly I have two of these for the wide body Hoover in the wash room is very similar but without the fron vent
Al