That's a Jazz from the mid to late 70s. Looks like an Olympic White that has yellowed with age. I think Fender was still using nitro for the clear coats at this point but the base color was poly? My tech is correct that many of the early Oly Whites didn't yellow much as they didn't have a nitro clear over them and the base was acrylic. Love how he's questioning the 3 knob configuration, obviously he's done his homework! I may install a stack knob config at some point but I've always preferred the 3 knob arrangement (so did Jaco, lol).