Gibson les paul custom dating
(Although, 1950's guitars have a rounded tenon end vs. A long neck tenon will extend most of the way underneath the neck pickup.
Honduran Mahogany as stated in the flyer released in 1968. One-piece mahogany neck (with two little separate wings to form the holly shaped headstock) throughout this category. One-piece mahogany back throughout.      NOTE: Approximately around serial number 535-537xxx in early 1969, a sixteenth of an inch laminate of maple appears ABOVE the standard depth 1pc mahogany back.NOTE: GT's will now have the traditional 'Les Paul Model' silkscreen over the finish on the headstock. Not sure what kind, but I'm certain its wood and not plastic.No 8xxxxx series guitars will have a small headstock.It is just for educational purposes and not precisely similar to the actual neck joints.       The most sought after Goldtops of this era will have a 50's headstock design.Around serial number 53920x-53924x, Goldtops jumped to a larger sized variant. Customs have had the larger headstock since the 50's to accommodate the multi-ply binding they exhibit.      This is the first of three major categories for late sixties Les Pauls.
As we progress through these three sections, the construction of the guitars will get further and further away from the 1950's style (and will decrease in value).
The Early Series are fantastic instruments with thoroughbred heritage to boot. They display decidedly 50's construction throughout and offer a great alternative to an older example.
When you hear the blanket term "1968 Les Paul" in guitar nerd conversation, it generally refers to this era even though a good bit of these guitars were made in 1969.
The long tenon is commonly considered the superior technique for attaching a neck.
These examples bring the most money and are accurate to 1950 specs.
Right: Orange label as used from January 1955 to 1964.