Use of Kiku Mon?

[FZ1]

A couple of months back, I was reading something on the forum that mentioned a reference source as to which smiths were permitted to use the Kiku mon (in  the 1600s, not the original use by Go-Toba)  I've used the forum search facility, but I can't find it again.

 

Please could anyone enlighten me as to where I can find a list of entitled smiths?

 

Thanks

 

Jon