Ford 5600 Conflicting Date Information

Appstate99

New member
Ford 5600

Production # 1M07B

I'm trying to determine the year of a Ford 5600 Tractor but finding conflicting information online. Several sources say it was manufactured between 1975-1981, but I have also seen 1965-1974 on other websites. I know what the remaining letters and numbers are. Which set of dates are correct?

Thank you!
 
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