jim,
The barrels could be 11, but I suspect they are more likely 10-bore. Almost all known 11-ga Parkers have Serial numbers below 6000, but there are a few exceptions even higher than this. The only way to know for sure is to measure the bore diameters. The 10 B shells used in that time period were larger than a modern 12-ga and smaller than a modern 10-ga. Even though chambers can provide a clue in the hunt for the elusive 11-bore, the final answer can only be given by checking the bores.
Richard
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