A very lucky find! I have only seen one or two examples before so it's a scarce heater, you will probably have to make a guard and the link below shows a complete example of that heater. It should have a wire mesh mantle, the one which is fitted is made from asbestos and it's not safe to use and it's currently fitted upside down. Solar heater
Nice example and seldom seen - but it does look like an old Tilley asbestos heater mantle has been fitted.