Locksmith Rokubei - Locksmith Rokubei

Japanese: 鍵屋六兵衛 - かぎやろくべえ

… It is said that these bills were first used by the Osaka money changer Tennojiya Gobei, who heard about the use of bills by the magistrate Aoto Saemonnojo (Fujitsuna) of Kamakura, and adopted them. The full-scale circulation of bills developed after Osaka money changers Kobashiya Jyotoku and Kagiya Rokubei joined in. This was because the bills circulated in Osaka were silver bills issued mainly by money changers. …

From 【Exchange】

…
[Money exchange shop in Osaka]
Money exchangers flourished in the three major cities, with Osaka having the longest history. The money exchange business began with Tennojiya Gobei, and was later joined by Kobashiya Jyotoku and Kagiya Rokubei. In 1662 (Kanbun 2), both Tennojiya and Gobei began to serve the shogunate. It was in this year that the name money exchanger was officially recognized.

*Some of the terminology that refers to "Kagiya Rokubei" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…　こうした手形も最初は，大坂両替屋天王寺屋五兵衛が鎌倉の奉行青砥左衛門尉（あおとさえもんのじよう）(藤綱)の手形使用の故事を伝聞し，採用したのに始まるといわれる。本格的な手形の流通は大坂の両替屋小橋屋浄徳，鍵屋六兵衛の両名が参加した後に発展していく。それは大坂で流通した手形が両替屋を軸に振り出された銀手形であったからである。…