The Sheriff's Star Campy C-Record hubs are milled (same method as CNC but not computer driven). Campy equipment at that time had huge status in the keirin circuit and riders with rare Nuovo Record track components were envied. Women married them for their Nuovo Record track groups.
Well, this certainly helped get an NJS stamp for the C-Record track ensemble. Here's a good example of how NJS certification doesn't really mean you have the best equipment -- like with the Shimano Dura Ace 7410 seatpost, C-record components just weren't all that good, at least in their early configurations (think about the aero seatposts breaking, about the problems with Delta brakes, and the early C-Record cranks). But the equipment did get a certification. It's identical to non-stamped equipment (except for the stamp of course). There's no piece-by-piece testing when it leaves the factory, but when you build up a NJS wheel and plan to race it at a parimutuel keirin track, the wheel is then subjected to stringent testing. You have to pay a fee for every piece of equipment that gets stamped, which is why Campy only did a fairly small amount of the stuff. The word got out in Japan eventually that the C-Record stuff was pretty but not as reliable as Sanshin, Suntour, etc., and demand withered. Campy didn't really bother to pursue that market again. They were at the low point in their manufacturing history and it took a few years to get back in stride. Today they hardly care about track and offer just a paltry range of dimensions in some very dated equipment. They haven't spent a dollar on track equipment design in fifteen years. They simply see the road market as their focus.