Early thinner material = has warped.
1968 GIBSON SG STANDARD VIBROLA TREMOLO ARM USA
1982 GIBSON SG STANDARD TRUSS ROD COVER USA
1969 GIBSON SG STANDARD KNOB USA
1978 GIBSON SG STANDARD KNOB USA
1969 GIBSON SG STANDARD BRASS SHIELDING USA
1971 GIBSON SG STANDARD ELECTRONICS BACK PLATE USA