Square shoulders are a dead giveaway to a Norlin-era Gibson J-45. 1970 or later. Ignore the diagram. Gibsons from that era featured a double-X bracing pattern on the top with a large, diamond shaped rosewood bridge pad between the two Xs which prevented the top from vibrating optimally. They also made any repairs to the bridge area so complicated as to be virtually impossible or very, very expensive. Necks were also set at a much shallower angle than they were prior to 1969, making the need for neck resets on those guitars more frequent.
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