This note is almost perfect. If you view the section of the Francis Howard Greenway portrait you will notice to the lower left some extremely light crinkling in the paper.
It is from the final year of paper banknote production and has no plate identification letter.
The final 1991 year of production is split into 2 Renniks categories, those with and those without the plate letter.
Regardless, this is still a very nice note for any collection.