According to the cert label, it is 9M which was a white specific to 1986, and there is a digit under tape...but can't really tell what it is. Does it look like the top of a 7?
Body code looks like it could be DK4, which would make sense...Chesnut Knit & Vinyl...
1994 F150 4x2 Flareside. 5.0 w/MAF, 4R70W, stock.
1984 F150 4X2 Flareside. Mild 302 w/ 5spd. Sold.
1980 F150 4X4 Flareside. 300i6 w/ 5spd. Sold in 2021.
1980 F100 4X2 Flareside. 351w/2bbl w/NP435. Sold in 1995