Here are five envelopes containing cash documents from around 1991 when I was doing business with Daiwa Securities. The backs are plain white. Based on the markings, the envelopes appear to have been manufactured in 1988. The size is approximately 22.5cm tall and 13.5cm wide, which is the standard size for postal mail. These items have been stored at a private residence for a long time. There is some age-related wear and tear, including dirt, stains, discoloration, scratches, and creases. The computer and Famicom being used by the olive character give a sense of the era. They will be shipped using recycled packing materials.