This Original Nichiren Mandala Gohonzon is dated:
The conferral notation is:
亀姫護也
Here is look at eacg of those 4 kanj:
亀 = kame -- tortoise, turtle.
http://www.mahou.org/Kanji/3535/
姫 = hime -- princess
http://www.mahou.org/Kanji/4931/
護 = go / mori -- safeguard, protect
http://www.mahou.org/Kanji/386E/
也 + ya -- to be (classical)
http://www.mahou.org/Kanji/4C69/