What is the name or classification for the embellished numerals on dollar bills? Is there a Dover book you could recommend for me to source more examples?
LTR Federal might be what you're looking for:
Argh Pattyfab, you were faster than me. LTR Federal is the closest match, for it actually comes from the bill, though you may find similar types here and there; but you can not find something as detailed and complete as letterror's.
Big Figgins is a classic example of the genre.
(Wondering what project Sam is working on. I just read in the paper yesterday that the US government is going to start adding color to the five dollar bill because counterfeiters have been bleach fives and then reprinting them as 100s.)