Fitchburg, Massachusetts. $20 1882 Brown Back. Fr. 501. The Safety Fund NB. Charter #2153. PMG Very Fine 30.A pleasing 1882 $20 from this Worcester County bank that is just one of four $20s reported from here. This note is seen with massive boardwalk margins, excellent bold inks, and sharp signatures. While the grade is only Very Fine, it has the eye appeal of a full grade higher. One of the best with one of the best titled banks.