Quote Originally Posted by Fikira View Post
登録商標 = tōroku shōhyō = registered trademark

亀寿 = Kameju (=trademark, sometimes with markings of master Tsurayuki)
亀寿丸撰 = Kameju marusen
With the quickness! Thank you, sir
If I may though, what is marusen? I tried googling, nothing found seems relevant to the topic