The first early prototypes made around 1986–87 featured a 21-fret neck, a 21 dB mid-boost circuit, an active/passive toggle switch (which has been deleted on the final release) and Schaller locking strap buttons. The final product (released in 1988) is essentially a vintage 1957 reissue Stratocaster featuring a deeply contoured select alder body, a 1-piece soft "V"-shaped maple neck fitted with 22 vintage-style frets, flat 9,5" radius and BiFlex truss-rod system, a "blocked" original American Vintage synchronized tremolo, Gotoh/Kluson tuning machines, 1-ply white pickguard and three Fender Gold Lace Sensor pickups powered by an active MDX mid-boost circuit with 25 dB of gain and TBX tone controls, which helped augment the tone of the sound delivered, opening up a wider tonal range Clapton desired.