Armond,
The 68% choke was the result of testing the loads available shot through the constriction at the muzzle. Chances are that then hardened shot, plastic shot cups, and progressive burning powders were not available. These modern components lessen shot deformation which in turn results in more shot in the pattern. If you chose to pattern that barrel with today's ammunition the effective choke may likely be even tighter.
Today a constriction in a 12 gauge of .030" will produce the same effective pattern as .040" constriction did when most Parkers were made.
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Threaded Mode