Elegance obviously means different things to different people. For me, it's an aesthetically pleasing design that functions very well and has no unnecessary pieces, every part has a function. So many basses satisfy those criteria...All of the Leo Fender designs, Sadowski's upgraded Jazzes, Ken Smith, The Fodera four string yin yang, some of the early hollow bodies, like the Rivoli, Warwick Thumb design....But the Jazz? If people still build wooden electric solid body basses 100 years from now, someone will be building jazzes and precisions because of their elegant functionality. Stingray too.
Rob Allen is in a different category. Great functionality through a limited range, but its aesthetic elegance is undeniable.