I'm a fan of Luther Burbank and have visited his experimental farm at Sebastopol a few times. I'm not familiar with any work that he had done with figs so I wonder if this is a fig he "just" planted, not developed. I have a book, Luther Burbank, His Methods and Discoveries and Their Practical Applications printed in 1915. I bought it on eBay several years ago and it was part of the library in Lansdowne, PA originally. I don't find any mention of figs in it.