[Twice Shooter]

Winchester also contracted with outside engravers for Grand Americans. A good friend who is also a world known engraver, Sam Welch, engraved at least one Grand American for Winchester that I know of. I suspect they contracted with outside engraves when they had a backlog or were looking for specific talent.
Another friend used to work in a Winchester contract shop in North Carolina.
Cheers, Tom

You might want to go the Firearms Guild of America website and ask on their forum who has engraved for Winchester.