The most unique feature of this banjo is the "Flower Pot" inlay in the headstock.  This is the only known Gibson Mastertone to sport this inlay, which was used mostly on the L-series guitars of the day, as well as mandolins from the 1920's on up.  This is probably an indication of the cost-saving mode in the banjo shop at Kalamazoo leading up to WWII.