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National NRP B Series Black Rust (658)

The original Duolian arrived in 1930 as National’s basic steel-bodied, single-cone guitar and soon became famous for its musical sound. Our NRP B Series replicates the vintage Duolian — and these modern reissues surpass most old ones in quality, playability, and even tone. The thin-gauge steel body is period-correct, featuring flat-cut f-holes, traditional sieve resonator coverplate, and a formed back. Still, no two NRP guitars are alike: The bodies are finished with a multi-stage, hand-textured finish for an individual look and semi-smooth surface profile that emulates the original Duolians. The mahogany neck with truss rod is capped by an unbound ebony fretboard complete with mother-of-pearl position markers. Vintage-style plain tuners, ebony nut, and “National” stamped into the slotted headstock complete the look of this classic. But it’s the trademark sound that makes these guitars so special — almost like a ghostly evocation of the best vintage 1930s Duolian. The sound is powerful and loud, while still being deep and warm. Like the hallowed originals, the NRP is steeped in mojo.



  • Top Wood: Steel
  • Back Wood: Steel
  • Scale: 25"
  • Nut Width: 1.825"
  • Frets To Body: 12
  • Resonator: 9.5" Hand Spun
  • Fretwire: W- .106 H- .039
  • Serial Number: 19873
  • Neck Wood: Honduran Mahogany
  • Fretboard: Ebony
  • Bridge: Maple Biscuit
  • Headstock Shape: Slotted
  • Headstock Inlay: Stamped
  • Tuners: National Brand
  • Inlays: Mother of Pearl Fretboard Markers
  • Nut Material: Ebony
  • Body Depth: 3.125"
  • Lower Bout Width: 14.00"
  • Upper Bout Width: 10.25"
  • Case: Hardshell Case Included