There's a lot of hoopla about knobs, some vintage knobs sell for as much as $100 each (ounce for ounce more than gold). If your looking for knobs study these pics, look at the shades, spokes, ridges, tooling, "tits", font, point and nuances. You'll be better for it.
Vintage Fender Stratocaster Pre CBS knobs, made of bakelite, vinyl, plastic, nitrate.