yes i will be honest i noticed that too , many times over the years reading old articles .not just the tail Lewis but head and neck shape and stance has changed a lot in my opinion .its a very early mention of widowhood , have read old books from the 1930,s on widowhood before ,and even then it did mention some had flown the system for nearly 30 years. i dug out an old "pictorial" article for a site member ,and read through it before gifting it to him ,was a very good article on the " yb darkness system" ....... the copy was dated 1974 i think ??