I recently refurbished a fairly beaten-up 2002 Squier Affinity Strat for a friend and fitted some new pickups to it.
The old ones looked fairly standard from the top:
But underneath they looked quite different. Definitely not the standard 'ceramic magnet stuck to the bottom with steel pole pieces' style than you normally get on budget Strats, and not the Alnico magnet pole piece types found on standard Strats. Was this a very thin strip magnet embedded in the base of the bobbin?
So I got the hacksaw and knife out and decided to take a closer look. I removed all the windings, cut off the plastic base of the bobbin and stripped away the plastic from the bottom of one side of the bobbin. This is what I saw:
I've never come across this particular construction for a single coil pickup before.
There are six short steel slugs that extend halfway down the bobbin, whilst the bottom half of the bobbin is filled with a bar magnet installed end-on under the slugs.
It's quite an involved bobbin moulding.
I never heard this guitar play in anger (broken and rusted strings) but I did have a similar 2002 (20th Anniversary Squier) Strat a few years back and that sounded OK, but nothing special in the way that basic Squiers do, so I had no compunction about removing them and fitting some vintage-style Alnico V pole piece pickups and it now sounds fantastic and plays really well (it had a very good neck).
The pickups came from Amazon under the 'Alnicov' brand name, and cost about £32(AUD$64) for a set. The only thing I don't like about them are the slight greenish-tinged (to me anyway) and very shiny pickup covers. But they fitted in the existing covers so that wasn't a problem. Otherwise great low-powered 50's Strat sounds.
https://www.amazon.co.uk/gp/product/...?ie=UTF8&psc=1