It is likely that any Parker .410 made before 1933, with 3" chambers, was probably drilled out to 3" at Parker Brothers. I say this because anyone would want the "new" 3" shell to play with and the makers would be the only source of a 3" .410 reamer at that time. I would not hesitate to regard an early Parker with 3" chambers as original or factory modified. An early 2 1/2" chamber Parker .410 is probably a rare bird.
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