Grace Wiggins posted these hubcaps to Facebook hoping to get a lead on who made them.
Given the rather ‘sloppy’ serif element at the top of the “J” I’d say these weren’t factory. And, I would be shocked if they were made in the US given Willys Motors and Kaiser Motors’ trademarks.
If does look like they are large enough to fit over most 4WD hubs, which would suggest they weren’t for 2WD models, but I could be wrong.