Hi Dave
Yours is a long tenon neck, without the lip.
Tradionally Gibson referred to a long tenon neck join, as decribed in the photo from the book 'Beauty of the Burst' page 196, posted by MIJvintage, where the tenon has the extra lip joined into the pickup cavity, untidy, but it's there.
The short Tenon is where the tenon join can not be seen inside the front pickup cavity, as seen on modern day Gibson Les Paul's, and incredibly, most Korean made replica's.
The strength of the join is also formed by the fingerboard attaching as well.
Today some people refer to the tenon join without the lip as a medium tenon, which IMO is still a long tenon.
Hi Rup
Quite right with the off centred join, not sure why. Be interesting to find out.
I wonder why Tokai have the off centre, whereas, Orville and Greco don't for example. Another reason why our beloved Tokai are so unique?
Mick