This is an extremely rare stamper as they were not sold to the public. These were used in Japan during the 2008 stamp rally, you had to go to a 7-Eleven store and a worker would stamp your passport.
Stamp is larger at approx 2" tall and 3" wide. Comes with a ink pad as well.
Please note this is a used stamp and does show wear and ink stains, but is in overall good condition! Message with any questions!