Never heard of a "post Registered Magnum."
I HAVE read collectors to refer to an "Unregistered Magnum" which has the specific meaning of a .357 Magnum made before WW II after sales got so good they could not keep up with stamping the extra number and issuing the certificate. It does not refer to any post-war revolver.
There are reportedly fewer Unregistered Magnums than Registered Magnums, but that extra little touch of elegance is still preferred.
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