No way to tell unless it is mentioned in the record books, for a letter from our research chairman, that the gun was ordered chambered for longer shells.
FWIW I have a much later 0-frame, VH-Grade, 20-gauge, 26-inch barrel, in the 235xxx range that was shipped September 1930, and it still has the 2 3/8 inch chambers intended for the 2 1/2 inch 20-gauge shells.
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