Goodtones Vintage 50 complies with the specifications of a 1954 Strat. In this time Formvar wire was used. The result is a very warm strat sound with nice mids, which is typical for the Mark Knopfler sound.
The Goodtone Vintage 60 corresponds to the specifications of a 1967 Strat. At this time a change from Formvar to Plain Enamel wire took place, which markedly different characteristics and was used until the beginning of the 70s. The result is a very clean and dynamic sound.