Serial number 101621 was stamped on August 12, 1947 and cleared final inspection on December 23 that year.
The tuners are Kluson 210 machines with rounded metal buttons.
The bridge is a replacement and the pick guard is oversize and is probably not original.
Style 21 features:
Back and sides: Brazilian rosewood
Top: Sitka spruce
Binding: Tortoiseshell celluloid
Other period features:
Brazilian rosewood fingerboard
Brazilian rosewood belly bridge
Steel T-bar neck reinforcement
1-11/16" neck width at nut
Tortoiseshell celluloid pick guard
Dot fingerboard inlays
Decal on front of headstock
No C. F. Martin stamp on back of headstock
Photos courtesy of Schoenberg Guitars