I need help identifying a Ford screw-on hubcap

[Jim Skelly]

I found this in tall grass in the late 1960s along the side of a farm road.  It had been there a long time.  It appeared to be painted flat black and I showed it to my Dad, who said it was oxidized nickel!  I ended up cleaning it with chrome polish.  

 

It is nickel plated steel, 5 5/8" diameter.  I saw a photo of one once, and it was on what I believe was a 1937 Ford truck, but I couldn't find any photos today of such a truck using this hubcap.  I painted the Ford script because the old photo I saw had it painted.  

 

Thank you.

[Jim Skelly]

On Ebay, I found a rough one that was described as for a 1.5-ton Ford pickup front axle, 1934-1939.  It appears that it was also used on the 1940 model.  I'm not sure if it was used on any of the one-ton models during those years.