Samsung microwave oven (Brasenose OX11)

The microwave is clean, complete, fully functional and about 11 years old. I used it earlier today. It has a capacity of 23 litres, and the inside has a ceramic finish and so shows no signs of rust or deterioration. The dimensions are the same as the current Samsung 23 litre models and can be found online. The rotary control however is a bit erratic when used for setting the times for the clock and cooking time. I suspect that the nominal power of 800 Watts has degraded a bit with age so I set slightly longer cooking times than indicated. I can provide a download version of the user manual. The weight is of the microwave is around 12 kg so best collected by car.