Truss rod works. The case is not Gibson but is period. It had a massive M12 bolt with adjuster nut inside it to stop it bowing in the middle, very over engineered but maybe needed.
Gibson 2-button footswitch For Gibson Falcon 20 Brand New
Gibson F5 The Gibson Mandolin Inlayed Headstock Plate Also for Guitar
VINTAGE GIBSON RECORDING KING ARCH TOP GUITAR TAIL PIECE VINTAGE GIBSON RECORD K
2 vintage 1967 Gibson amp,speaker, badge, logo, nameplates, from Gibson cabs
Vintage 1960's Gibson amp, badge, logo, name-plates Gibson
Gibson Vintage Gibson 1953 L-4
