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Old 09-27-2018, 07:03 AM
Steve DeRosa Steve DeRosa is offline
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Join Date: Mar 2013
Location: Staten Island, NY
Posts: 9,116

Welcome to the AGF!

IME older lower-line Gibsons such as your L-48 had factory order numbers (FON) and rack numbers, but no serial numbers until the early-60's. On an archtop guitar these are located inside the back (the flattops I've seen had them on the neck block), and may be seen by looking inside one of the f-holes; FYI many of these had a letter prefix that would help you narrow down the year of production, as follows:


Later guitars would have had both a label (inside the upper f-hole) and a stamped serial number on the rear of the peghead - both of which would be readily visible - so I'm certain yours is a pre-1960 model.

Be advised that the ink used to stamp the FON numbers often fades with time, so you may have to do a little careful searching to find it (a pocket flashlight like the Mini-Mag would be helpful here)...

Hope this helps...
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