The 1828 SR number apparently wasn’t a Chrysler exclusive grind, either. A few folks on some GM and Ford forums looking for information on the same series of numbers stamped onto their cams, too.
In that case its one of millions made by one of the two big production cam outfits in Michigan and packaged in a Comp/Crane/Summit/Jegs/Elgin/Wolverine/etc. box.
Nothing bad about that (except it's not ground on a Mopar 904 core)...
