Info ducati 851 sp2

could the owners of ducati 851 sp2 tell me which year appears in the circle on the left and which letters in the circle on the right? thanks!

I knew it was rare, but not so much! Better for me!😎😎😎

The '89 cast in would be the year it was made, this would be correct for the '90 model year.
I can't help with the letter F though???

Steve R