The Evolution of the Gibson Super 400CES
1935
Super 400 released; carved spruce top, carved 2-piece figured maple back
1951
Super 400CES released; rounded cutaway; 2x P-90 single coils
1954
2x Alnico V single coils now standard
1955
Tune-o-matic bridge introduced
1958
2x PAF humbucking pickups standard
1960
Rounded cutaway changes to pointed cutaway; wide/flat neck profile
1961
3-piece figured maple neck begins to replace 2-piece book-matched type
1962
Fuller neck profile; 1-piece laminated figured maple backs appear
1965
Nut width narrows to 1/ 9 inches 16
1969
Pointed cutaway reverts to rounded; nut width reverts to 1 11 / inches; 2-piece 16 carved figured maple backs standard