Hi, I was trying to find information about a wooden Custom that I have and came across this site: http://estilofilos.blogspot.com/2013/09/datation-of-japanese-pens-i-introduction.html Links to parts 2, 3, and 4 of the article are on the right side of the web page. Looks like my pen was made in June of 1979. Moderators, if this is a duplicate post, please remove it. I apologize. Alex