The 4600C4 I just bought was a 4600C4MAG with magnetic cast control and in relatively nice shape for a $32.00 reel. I'll try to get some photos.
Those are very nice reels. If you take off the left side plate, the magnet assembly is kind of a pain to get back in there. Not hard, just a little fiddly.
It is an interesting setup. Now I have to find a 4600C4 or C3 that does not have the magnetic cast control for my project. Where I live 5000 and 6000 size ABU reels are uncommon, the smaller ones are rare.
Have a look at the Royal Express I, II, and III as well. They came in the 4000 size. The main difference between them and the C3 is the Royal Express has a graphite reel foot instead of metal like the C3 and C4. Royal Express I and II have a thumb bar and Royal Express III has the push button spool release.