Look inside the lower F-hole on acoustic/archtop models.
You cannot tell the year by the number alone. You must look at the Potentiometer Codes . gibson serial number lookup 6 digit
A distinct structural reinforcement bump added where the neck meets the headstock. Year Range Identification Look inside the lower F-hole on acoustic/archtop models
Look for the source code 137 (signifying CTS Electronics). gibson serial number lookup 6 digit
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Mostly used in the later Norlin years before the 8-digit system arrived. 🔍 Visual Anchors to Solve Serialization Duplicates