It started in April of ‘89.
April of ‘89 through April of ‘90 manufacture date cars got one that said “25 years”. After April ‘90 through 93, they omitted the 25 years wording. All models got the badge.
87, 88 and early 89s did not get it. I did add it to my ‘88s original dash
closest thing Ford did to aw knowledge the 25th anniversary. Lame