An O grade gun would be a Vulcan grade gun in the hammerless model. A P grade gun is a grade 1 gun and the twist steel barrels would be an indicator of a grade 1 gun also. You say the gun has a vent rib. In 1890 Parker Bros. did not offer a vent rib gun so the rib must have been added later either by the factory or some other outfit such as Moneymaker or possibly Simmons. Although I am not sure if Simmons did vent ribs on double guns.Good quality picture would be a great first step in solving this mistery.
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"Much care is bestowed to make it what the Sportsman needs-a good gun"-Charles Parker
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