Microwave (Heaton Mersey M19)

Sharp microwave oven. Large - 55cm wide, 37cm high, 41 cm deep. Heavy. Is about 40 years old but still works. However door doesn't always open when you press the button for this (possibly a spring has gone). But I have used handle of spoon to ease it and that has worked. At one stage it whistled when on, but that seems to have stopped. Sorry not a very good photo.