If you look at this picture of an American 1941 Ford Pick-Up owned by alanwoodieman, (which appeared in another Thread in Ford Barn) you can see that the Raised Moulding on the Door has only Two Ribs (Top & Bottom), while on the similar Australian models, they have Three Ribs, a carry over from previous years.
This Pickup is an American 1941 model Ford, as you can tell by the extra Chrome Trim on the Hood Side.