I have a chart that gives every month and year for every Modle a made. From first to the last It’s in my pictures. But Don’t know how or have a way to post it. If someone will pm me with e regular email address I’ll email it to them and maybe they can post it. It’s a really good chart
I was always under the belief that the middle cross member with the odd shaped holes (where they punched out the brake rod anti rattler brackets) was 1930 or later. I also thought that the 29 and earlier had square holes in that position. Maybe I am wrong.
You can see that the frame can be accurately dated as it is in the short time frame when the frame has been punched to take the solid bar emergency brake cross shaft. This frame has the earlier drop down hollow shaft typical of 28/29 .It will have factory blanking plates to stop the ingress of road dirt entering the brass cup bearing ends of the shaft. Ford brought out the frame holes then continued using up the early style . It is in the Service Bulletins around early 30 I think but cant find my yellow book right now.
John in very windy heavy rain Suffolk County England.