Serial number 68389 was stamped on November 19, 1937 and cleared final inspection on March 4, 1938.
The tuners are Grover G-98 pointed plate machines with rounded un-seamed metal buttons.
Style 18 features:
Back and sides: Mahogany
Top: Red spruce (Adirondack)
Purfling: Lines
Binding: Tortoiseshell celluloid
Back stripe: None
Other period features:
Scalloped advanced X-bracing
Ebony fingerboard
Ebony belly bridge
Steel T-bar neck reinforcement
1-3/4" neck width at nut
25.4” scale length
Tortoiseshell celluloid pick guard
Dot fingerboard inlays
Decal on front of headstock
No C. F. Martin stamp on back of headstock
Style stamp
Photos courtesy of Gruhn Guitars