Set-through necks are relatively uncommon, and few manufacturers produce such neck joints. Sometimes, especially if neck extension inside a body does not fill full scale length, such neck joint is marketed as an extended pocket set-in neck or deep-set neck.
David Thomas McNaught claims to be the first who proposed a modern version of set-through neck joint. "Set-Thru" is a registered trademark of McNaught Guitars in United States since February 25, 2003.1
Despite the trademark, some other companies use the term to describe their products, including Dean Guitars, ESP Guitars, and B.C. Rich.
As opposed to popular neck-through designs that emphasize the neck as one piece of wood and the body wings as (laminated) separate pieces by using transparent or semi-transparent finishes and contrasting woods, there's no such trend for set-through guitars. Usually, it's hard to determine if the guitar has set-through neck or neck-through body judging only the general outlook. B.C. Rich's Invisibolt Technology is one notable exception that uses black ("shadow") body and contrasting light neck wood. A second example would be Toone Guitars' deliberate emphasis of the neck joint as an aesthetic choice, in particular the exposed asymmetrical sliding dovetail joint.
"Set-thru" neck trademark information, serial number 78014000, registration number 2690889 at US patents office server. http://tarr.uspto.gov/servlet/tarr?regser=serial&entry=78014000 ↩