The present watch stands out by its multi-coloured technical scales. In fact, reference 6234 is better known to feature only one scale in colour whereas this example here combines two coloured indications, lending it a fascinating appeal and increasing its rarity considerably.
Different examples of reference 6234 in regard to case material and dial layout are illustrated in I Cronografi Rolex - La Leggenda, Pucci Papaleo Editore, pp. 254-276. The present watch is illustrated on p. 267.