I dont think these are the common US early replacement/Argentina repops. IIRC those are fabricated with a steel ring and individual bars and flash chrome so cheap that it rusts in a week in the Oregon desert.
These look to be one piece stamped, which implies some SERIOUS tooling. The finish implies a stainless part or excellent chrome plating. It would be helpful to know what the base material is.
Again, iirc, in 1941 the US was preparing for war. There were beginning to be allocations and restrictions and shortages on materials. I believe Ford used some stamped steel fender grilles on some military contract vehicles, and these could be quality plated versions of those, or Ford could actually have stamped some stainless ones.