The information above comes from Pilot’s 100th anniversary book and Twitter user @pentel_six shared us with part of them. I have seen the catalog of this book, the end of the book is an illustrated historical product introduction. In addition to what’s shared above, there are some other types of pen’s content. It’s kind of wordy to introduce the information about the book and the way to get it. So I won’t go deep into it here, anyway, I will try to get a copy of it early next year
edit later: now this book is available here: Supply - Books on Company History
file name: パイロット100年の航跡