G&L instruments produced since mid-2010 are shipped with a Custom Build Specifications sheet which includes the date the instrument was completed.
There are also dates labeled on the neck heel and inside of the body. These will give you an approximate idea of when the instrument was completed, typically within one to two weeks of the latter of the two dates shown.
From the early 1980s to early 1997, serial numbers were typically stamped into a neck plate. The serial numbers for guitars began with “G0” (G zero) and basses began with “B0” (B zero). However, in rare instances there are guitars which began with “B0” and basses which began with “G0” on neck plates as the factory may have run out of the appropriate plates.
Some early guitars and basses had serial numbers stamped into the bridge plates. These are usually from 1980 to about 1982.
From early 1997 to about mid-1998, serial numbers for guitars and basses began with “CL” and were applied as a decal to the back of the headstock.
From mid-1998 on, the serial numbers for guitars and basses began with “CLF”.
If you believe your G&L was made between 1980 and 1992, you may also reference the Chronology & Dating page. There is some information about later chronology on this page as well.
Please note that models since the late 1980s, particularly 4-bolt guitars and 6-bolt basses, do not come with owner’s manuals. The manual for earlier models covers how to adjust the micro-tilt neck feature no longer used on 4-bolt and 6-bolt models. Other aspects of the manual, such as pickup height adjustment, generally apply to newer models.