Gibson MB-1 "Trap Door" Mandolin Banjo 1923

A spectacular, investment-grade piece of 1920s jazz-age history. This 1923 Gibson MB-1 Mandolin Banjo features the highly sought-after plain "snakehead" peghead shape and a fully intact, factory-installed "trap door" mechanical resonator back. It has been professionally optimized by a luthier and plays perfectly right out of the case.

100% Factory Original Parts:

• Trap Door: Original spring-loaded mechanical back plate snaps open and shut perfectly to alter acoustic volume and projection.
• Pickguard: Authentic original cream celluloid factory pickguard (finger rest) and original mounting hardware are firmly attached.
• Tuners: Original factory tuning pegs are in great shape, functional, and hold pitch smoothly.
• Tailpiece: Original vintage-correct Gibson tailpiece and cover are present.

Luthier Setup & Playability:

• Ready to Play: Checked and set up by a professional luthier for accurate pitch, clear tone, and proper intonation across the entire fretboard.
• Head Tension: The 9" diameter pot has been checked and perfectly tuned to 90 lbs per sq. in. to maximize punch and eliminate harsh overtones.
• Action: Low and comfortable, making it exceptionally easy to play.

Specs & Historical Details:

• Year: 1923 (Verified by internal Gibson Factory Order Number batch 11772, sequence #5). Built during the golden Lloyd Loar era at the Kalamazoo factory.
• Model: MB-1 (Style 1) with the correct un-logoed headstock variation typical of early 1920s entry-level builds.
• Materials: Hard maple neck and rim stained to a classic dark brown finish.

Condition & Finish:
Features the original 1923 antique dark brown finish. It has normal surface wear and fine hairline aging lines expected on a 100-year-old Gibson, but there are no deep cracks, modern paint touch-ups, or repairs. The neck is straight, and the frets have plenty of life left.