I have an S/42 "G" date, serial 9522 "d", late model, acceptance proofs DE63 DE63 DE. The mismatched magazine is #2641 "d" with DE244 proof. I have another magazine in the "f" series with DE63 proof on it. Would the "correct" magazine for this late "G" have a DE244 or a DE63 proof? Was there a number where a transition occurred or was it just haphazard?