It means that you have a .410 shotgun, and that the barrel has been subjected to a "proof" test. A special high pressure shell is fired during proofing that has much more energy than any shell you could buy. If the gun can safely fire that very powerful shell, it has been "proofed", and should be safe to fire with any standard shell.
Savage did. It is a variant of the Savage-Springfield 944.
Up to $125 in top condition. sales@countrygunsmith.net
Worth about $150 - $200US, depending on condition.
A Springfield J. Stevens 410 gauge proof tested was made sometime between 1920 and 1940. If it is in good condition it has a value of between 300.00, and 400.00.
I have one made by O.F. MOSSBERG & SONS INC. New Haven CONN. U.S.A. NO.83B 410 GA - 3 IN PROOF TESTED
Manufactured sometime between 1948 and 1991 and worth $25 to $125, depending on condition.
The nominal bore of a .410 shotgun is.410 inch. Which is why it is properly called the .410 bore instead of the .410 gauge. In Europe it is sometimes called the 12mm, which is an inaccurate designation as a .410 bore has an actual diameter of approximately 10.4mm by metric measure. If the .410 had been named in the traditional fashion, by the number of lead balls .41 inch in diameter needed to make one pound, it would be about a 67-68 gauge.
410
Yes, for sure.
The 870 Wingmaster is still made in .410
Iver Johnson did not have a 410 gauge or bore in 1907. The 410 came along about 1920.
$825.00