Serial number 55662 was stamped on March 3, 1934 and cleared final inspection on Jun 13 that year.
The tuners are Grover G-97 machines with seamed butterbean metal buttons.
Style 21 features:
Back and sides: Brazilian rosewood
Top: Red spruce (Adirondack)
Sound hole decoration: Herringbone
Back stripe: Herringbone
Other period features:
Ebony belly bridge
Ebony neck reinforcement
1-7/8" neck width at nut
Tortoiseshell celluloid pick guard
Slotted square fingerboard inlays
Decal on front of headstock
C. F. Martin stamp on back of headstock