Days ends with "3" are Sando-day You can get double stamps by purchasing sandwich products Izutsu Maisen Co., Ltd. will mark the 3rd, 13th, and 23rd of each month from January 3, 2023 (Tuesday) as “Sandwich Days”, and will give stamps to customers who purchase sand at directly managed stores nationwide. Double the normal amount. ▼ Maisen Sand Day Target date: After January 3, 2023 (Tuesday) Implemented on the 3rd, 13th, and 23rd of each month Stores directly managed by Mai