Actually, just came across this. Apparently Rickenbacker measures their scale length the "enlightened way."
Question: I always thought that Rickenbacker basses were 33-1/2" scale. In fact their older literature states this scale measurement. Recently, I checked out the Rickenbacker website and the basses are now listed with a 33-1/4" scale. Did Rickenbacker recently shorted the length of their bass scales by 1/4"?
Answer: No, the scale is the same. This is the difference between the old method of measuring scales vs. a more modern, and I hope enlightened, method. In the past, the scale length was measured from the inside edge of the nut to the average of plus and minus bridge adjustment. This takes into account that some strings maybe be adjusted longer than "scale" and others shorter to intonate properly. Now most companies, including ourselves, measure from the inside edge of the nut to the inside edge of the12th fret and double it, which is more theoretically precise number.