Dave's answer is most likely on track. a 28 gauge on an O frame that late in production would be pretty unique. Standard 28's of that era were OO frame gun's. But as we often say "Ya never Know'. Someone could have wanted a "heavy" 28 gauge gun. If the info is available I would get a letter on that gun.
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"Much care is bestowed to make it what the Sportsman needs-a good gun"-Charles Parker
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