Some time ago Rick 99 was kind enough to send me a table that Fug put together with data on 36 .410 barrels. The breakdown of barrel addresses is:

Style 4 - 20 barrels
Style 6 - 5 barrels
Style 7 - 4 barrels
Style 8 - 3 barrels
No address - 3 barrels (all of these had a comment "reworked ?")

For four of the Style 4 barrels there is a comment "(single)". I have a 22 inch .410 barrel with a single line Style 4 address. (There is no line with the patent dates.) I know of no way to date .410 barrels other than by the barrel address. Does anyone know why some Style 4 barrels have the two line address and some have only the single line? Did Savage start making them with just the single line, then switch to the two line, or vice versa, or ?????