Had nickel-plated hardware and a dark-finished maple neck and resonator, with white binding on the neck and both edges of the resonator. It did, however, feature the same pot metal one-piece flange and three-ply maple rim as the Mastertones of the same period. Gibson banjo TB-1 #234-13 Gibson T B-1 # 234-13, the 'Bob Bontekoe' The of the 1930s was a non-Mastertone model and therefore had no true tone ring-only a small-diameter brass hoop on top of the rim. Serial Numbers and history of Pre-war Gibson Banjos with specifications and history. Only FON and there seems to be no connection. Jim Mills goes into details in his new prewar flathead banjo book about why the banjos did not have serial no. I encourage all Loar and Gibson affecionatos to fully read this book by Walter Carter (Gibson - 100 Years).