The 00-21 Golden Era is a recreation of the popular small-bodied slotted-head 12-fret Martin guitar that was a favorite for decades. The 00-21 uses the same specifications as pre-W.W.II versions of the guitar.

The body is crafted from Adirondack spruce and both the back and sides are book matched East Indian rosewood. The spruce top is 1/4-inch high and scalloped with the pre-W.W.II original vintage bracing pattern. The unbound ebony fingerboard has abalone square inlays at the 5th, 7th and 9th frets. The center ring of the rosette is inlaid with fine herringbone marquetry with herringbone back purfling. The body is finished with polished gloss lacquer with dark filler and the sound board is aged with a subtle toner.