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Yes, it is 3" x 5.5" and ~ 1" at the thickest part. It came flatten. A VERY comfortable size to hold in your hand (at least my hand) or place it on the table. You get lots of feedback as you move the...

I do not think this stamp says nakayama on it.
Nakayama kanji looks like that:
中山
Stefan

Thanks JimR and Stefan for the corrections... sometime just being able to read the text is still not...

Just go this one from chefknivestogo.com. At the website, it is called "Jyun-syou-honyama" that they had bought from Imanishis stone company, however, the stamp saz "Genuine Naka yama?" I am not sure...