Help dating a Fordson

[CWAMuseum]

First off, I know I could say "circa 1920s" and it would be adequate, but if possible, I'd like to come closer. This tractor does not have a serial number on the engine block so presumably it was replaced sometime. I'm attaching photos from all around it in hopes I can get at least early 20s, mid 20s, or late 20s.

Thanks in advance.

 

[CWAMuseum]

I found a casting number on the engine block so I'm going to use that date: 2-14-19