No roll stamping on top of rib, it will be hand engraved. TPS lists aprox 407 vent ribs guns in all grades and gauges. There are some books missing from the mid to late 20's at the time vent ribs became widely available. Even so it is safe to say any original vent rib is rare, the fact that Damascus barrels were special order after vent ribs were introduced makes them very rare IMHO.
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