The image is of an old Japanese stamp depicting Mount Fuji and the Imperial Chrysanthemum crest. The denomination is "20 sen," which was a currency unit used from the Meiji era to the early Showa era. Details about this stamp are as follows: Denomination: 20 sen. Design: Mount Fuji, the Imperial Chrysanthemum crest, etc. There is also another one, 8 sen. Please check the condition in the photo.