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also of interest is how various Italian bike/components manufacturers particularly between the early 70's and mid 80's pretty much all did it
no doubt all the frame manufacturers would claim to be of the worlds best, campagnolo in that era arguably was the best in its field, as a collectors item, your right, it does reach a premium, i was one degree of separation from one, picked up a ciocc Concorde astore frame for chips and the vendor said it previously had 50th gruppo
.....the main reaction that signature engenders is for fat, overstuffed collectors Worldwide to reach for their fat, overstuffed wallets (see also 'wallhanger' and 'Colnago C35').