A red seal for travelling to a foreign country - Ikoku Kaigoshuinjo

…It is also called a “Goshuin-sen.” A “shuin-sen” is a ship that was issued a travel certificate or a ship’s registry certificate by the government for a foreign country (more precisely, for the South Seas region) in the early modern period, called a “goshuin-jo for foreign ships.” In this case, the premise was that the Japanese government that issued the shuin-jo and the government of the other country that wanted to recognize its validity had mutual understanding, approval, or the establishment of an agreement regarding the shuin-jo. …

*Some of the terminology explanations that refer to the "Foreign Sealing Certificate" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…〈御朱印船〉ともいう。朱印船とは近世初頭において政府から〈異国渡海御朱印状〉といわれる外国向け(正しくは南洋諸地域向け)の渡航証明書，あるいは船籍証明書を与えられて渡航した船舶をいう。この場合，上記の朱印状を発行した日本の政府と，その効力を認めようとする相手国の政府との間に，相互にこの〈朱印状〉についての了解，承認，あるいは協定の成立が前提となっていた。…

※「異国渡海御朱印状」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報