Up through the November 1932 Winchester catalog the chokes offered were -- full choke, modified choke and cylinder bore. The 1933 Winchester catalogs added improved cylinder, improved modified, WS-1 and WS-2. The Model 21 Skeet Gun first appears in the 1933 catalog in Tournament Grade, Trap Grade and Custom Built Grade. I have a Winchester Skeet brochure that discusses 1932 wins with the Model 21 Skeet Gun and describes it bored improved cylinder in both barrels?!?
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