Riken 6-go Pressure Cooker NS-400 Please refer to the instruction manual for usage. This item is from a house clearance. It appears to be a rather old product. There are no signs of it being used on a fire, so I believe it is unused, but it has some dullness and dirt due to long-term storage. The back of the instruction manual has a date of 97.07.15. The outer box is damaged. It may be shipped without the original box and placed in another box.