Jimbei is a famous Japanese sanke breeder with the type of sumi you have as one of his hallmarks. He is the honorable grandfather of the sanke world in our time. Some say he is old hat, but I say he is the foundation we will always need who does not deserve such trifling public remarks.

Here is a link to tell you a little about him and some other breeders.
http://www.japankoionline.com/breeders.html?1151441435