Serial number 71476 was stamped on October 21, 1938 and cleared final inspection on December 9 that year.

The tuners are Grover G-98 pointed plate tuners with unseamed butterbean buttons.

Style 21 features:

Back and sides: Brazilian rosewood

Top: Red spruce (Adirondack)

Purfling: Lines

Binding: Rosewood

Sound hole decoration: Herringbone

Backstripe: Herringbone

Other period features:

Scalloped rear X-bracing

Ebony fingerboard

Slotted square fingerboard inlays

Ebony belly bridge

Neck 1-3/4" wide at nut

No C. F. Martin & Co. stamp on back of headstock

Style stamp

C. F. Martin & Co. decal on headstock

At the time of writing (April 12, 2019) this guitar is available at Schoenberg Guitars (http://www.om28.com/ProductDetail?product=P170713002)

Photos courtesy of Schoenberg Guitars.