I finally got enough time to do a little checking on your note. Summer is my busy season for work. Using the Kravitz book already referenced, and assuming that your note looks in appearance like the example also already posted by Fuzzy317, you have a Fifth Issue, 50c note, cataloged as Friedberg #1381. However, you mentioned that it has Allison/Spinner signatures. FR1381 notes have a Series 1875 date but the signatures are actually Allison and New. New had a squiggly signature similar to Spinner so at a quick glance it could have been identified as Spinner. For info, William Crawford is the portrait on the note. He was a Georgia State Representative, then State Senator. He then served as Secretary of War from 1815-1816 and was Secretary of the Treasury from 1816-1825. There were 13,160,000 50c Fifth Issue notes printed in 2 types. The 1381 has blue fibers in the right end in an attempt to discourage its counterfeiting. The 1380 is pink paper with silk ends. Values range from $25 in VG to $225 in Gem Uncirculated. Hope the info helps!