Serial number 72686 was stamped on May 23, 1939 and cleared final inspection on September 24 that year.
The guitar has rear-X bracing but retains the 1-3/4" wide neck. Style 18 guitars usually had black celluloid binding but the binding on this guitar is tortoiseshell celluloid.
The tuners are Grover G-98 pointed plate machines with unseamed butterbean buttons.
Style 18 features:
Back and sides: Mahogany
Top: Red spruce (Adirondack)
Binding: Tortoiseshell celluloid
Other period features:
Brazilian rosewood belly bridge
Steel T-bar neck reinforcement
Nickel silver T-frets
No "Made in USA" stamp on back of headstock
Photos courtesy of Steve Swan Guitars