JP-94895
On the back, there is a text written in Japanese, pero yo comprendo NADA!
But well, as precious google says, Sendai is the capital city of the Myagi Prefecture and the largest city in the Tōhoku (northeast) region.
Ive always found that word "prefecture" interesting...and that Japanese division in general.
and a cute Japanese stamp from the year i-have-no-idea-which-one....