The earliest known Ford badges were oval (1912-1915) with the winged Ford logo and a number. 1915-27 were Model T shaped. In 1918 they introduced the Radiator style concurrent with Model T style.
There is a great reference book that is very detailed about the badges.
https://www.hemmings.com/stories/201...passes-permits
My guess about your item...R.C. Ross was the guy responsible for stamping the numbers onto the tool checks and decided when no one was looking to personalize one.