The exact neck widths for each model currently in production (basses
   too) are included in the specifications for each model on the Rickenbacker 
   web site, http://www.rickenbacker.com/

   Most Rickenbacker guitars in production today come with a neck that is 
   1 5/8" wide at the nut, and 1 15/16" at the 12th fret.  But there are
   also some Rickenbackers guitars in production which have a wider neck,
   measuring 1 3/4" at the nut and 2 1/16" at the 12th fret.  If you're 
   looking for a guitar with a wider neck, here is what John Hall has to say:

      "The Tom Petty Limited Edition, the 380L Laguna, and the 650 Series 
       all have the same wider neck, essentially the same as a Les Paul 
       (although we chose to have a different shape).

       But we also announced two new models to our dealers on Decmber 
       24th [1997]. . . the Model 660 six stringer and the Model 660/12 
       twelve stringer, which all have this wider profile neck. These are 
       now in standard production and pretty well gives everyone a choice 
       of their favorite neck width in the Rickenbacker line."

       [John Hall, ceo@rickenbacker.com, 12/26/1998]