When Masamune was summoned and confronted with an evidential letter by Hideyoshi Toyotomi upon the suspicion of instigating Osaki Ikki (the revolt of the former retainers of Osaki clan with the peasants of the region), Masamune made an excuse regarding the letter by indicating the lack of a pinhole on the letter at his seal mark of wagtail.
大崎一揆煽動の疑惑で豊臣秀吉に呼び出され、証拠の文書を突きつけられた際証拠文書の鶺鴒の花押に針の穴がない事を理由に言い逃れを行った。