There, they spoke about their decision to become born-again virgins."We decided to go 60 days without.

For more details on Gibson Serialization prior to 1975 and historical product specs, use your Gruhn’s Guide or view the following PDF files: Since 1989, all Gibson acoustics are built in Bozeman, MT and all Gibson electrics are built in Nashville or Memphis.

Ranking numbers for Bozeman start each day at 001 and the electrics may start as low as the 300s.

The age of a Gibson guitar, along with the physical condition and relative rarity, are the major factors in determining its value.

While physical condition can be assessed with a careful inspection, rarity and date of manufacture are not always easy to determine.

But the serial number on a Gibson can tell you when the guitar was made.

With that information, you can determine its rarity and, ultimately, its worth. For acoustic instruments, the serial number is typically located inside the sound hole at the neck joint or on a piece of paper glued inside the guitar and visible through the sound hole.

Most will be 5 to 6 digits in length, but the earliest examples feature 4 digit serial numbers.

There should be a space after the 1st digit with the 4 and 5 digit serial numbers, and no space with the 6 digit numbers.

The only difference is the addition of this batch indicator.

Les Paul Classic: This model features an ink stamped serial number with no “MADE IN USA” (just as we used on the original 1952-1960 Les Pauls).

Just say it," Gibson playfully told his wife on the radio program.