Does the back have any kanji?
If it's a Kasumi, it's White #1. If it's Hongasumi, it's Blue #1.
I was in a similar position around Christmastime last year. See this thread: http://www.kitchenknifeforums.com/showthread.php/21052-Masamoto-Steel-ID?highlight=Tsukiji
There is nothing on the back side, this was the only kanji on the knife.
I bet it's a Kasumi, White No. 1.
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