Thanks Jim, yes I'm aware the Patented WS1 choke is a reverse bell/hourglass profile, and unless special ordered the WS1 was typically on the right barrel of 21's. Same with the special hourglass profiled/right barrel choke of Fox "Skeet and Upland" guns whether double or single triggered. Not sure how Savage/Fox worked around Winchester's Patent. All told it seems that Parker's system for Skeet with left barrel more open choked was atypical.
Adding to my earlier post, I also owned a 16g Model 21 s/n 161xx that was stamped "Skeet" on the trigger plate, and it had full tapered chokes in both barrels, no reverse bell/hourglass choke in either. Right barrel .012" constriction and .015" in the left barrel. Winchester would do pattern testing and boring adjustments to confirm patterning as intended/ordered ..... the Big Red W didn't just rely on the difference between bore and choke diameters. Quality from a well respected company!
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