An archtop guitar is a hollow acoustic or semi-acoustic guitar with a full body and a distinctive arched top, whose sound is particularly popular with jazz, blues, and rockabilly players.
Typically, an archtop guitar has:

Six strings
An arched top and back, not a flat top and back
A hollow body
Moveable adjustable bridge
F-holes similar to members of the violin family
Rear mounted tailpiece, stoptail bridge, or Bigsby vibrato tailpiece
14th-fret neck join

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