You got a S2 proto (as per your other thread) so stuff isn't going to make sense. C4 could be R&D code for "S2 CU24" or it could mean it's a 4th revision of the pickup they want G&B to make for them or it could mean nothing. Who knows!
You do have a cool guitar though, and I bet it plays and sounds great since it went to an endorsed artist.
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