みとめいん

認め印
unregistered (informal) seal
a signet (ring)

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みとめ(いん)【認め(印)】

a private seal; a signet.

●認め(印)を押す stamp [affix] one's private seal 《to…》

・この欄に認め(印)をいただけますか. Would you put your seal in this space?