Serial number 41927 was stamped on March 21, 1930 and cleared final inspection on May 13 that year.

The banjo tuners are modern replacements while the white celluloid buttons are original.

The ebony pyramid bridge is a modern replacement made by luthier TJ Thompson.

OM-28 features:

Back and sides: Brazilian rosewood

Top: Red spruce (Adirondack)

Purfling: Herringbone

Binding: Black celluloid

Backstripe: Zig-zag pattern

14-fret neck with 25.4" scale length

Neck 1-3/4" wide at nut

Small "OM" pickguard

Other period features:

Advanced X-bracing with scalloped braces

Ebony pyramid bridge (the first ebony belly bridge appeared on guitars stamped in early April 1930)

Ebony fingerboard

Diamond and square Japan pearl fingerboard inlays

Ebony neck reinforcement

Nickel silver bar frets

"C. F. Martin & Co." stamp on back of headstock

No style stamp

No decal