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 Maisen nationwide https://mai-sen.com/shop/
Target Products Fillet and sandwiches, shrimp and sandwiches, an butter sandwich, cheese minced
meat and sandwiches, minced meat and sandwiches, potato salad sandwiches, mixed sandwiches, pocket sandwiches, and sandwiches