Hi,
I took apart an early tri-sonic (seperate magnet type) when I was restoring my first early-ish v.artiste....
You have the chrome cover , with the holes in , and the bottom plate with the tabs on it with holes that allow the height adjustment screws to pass through, all the same as the later type. But that's where the similarity ends (unless you have the much smaller sized tri sonic that were fitted to the early artistes / v.artistes, as they are smaller,but made the same way)
The 6 seperate magnets are riveted to the bottom plate, and then the wire coil is tightly packed around the outside of the magnets, wrapped in what appears to be masking tape.
Although, the later pickups that were fitted to the Sonics (bar magnet type) were regarded as a cheaper version to manufacture, I think they are the definitive sound of the tri sonic. Also they are the same type that Brian May stuck in the red special.