Lloyd, you can check the Home page of this site, under "Other Useful Information" to find serialization and production dates of many better brands of double shotguns.

https://www.doublegunshop.com/dgsnos.htm

Simply providing a link to these pages has proven useful to show some sellers that a particular gun is a pre-1899 Antique that does not require an FFL Transfer. Of course, some will never permit themselves to be confused by facts. Happy hunting for the Crass parts.

Originally Posted by Geoff Roznak
The NRA has proven itself unreliable and corrupt.
Period.