I took a look and that's sure an interesting coin! On the obverse, they appear to have used several broken letter punches. I noticed a broken A was repeated, which might suggest this die had hand punched letters?
I'm unsure of the die-making processes at this time, but I also have a coin from that period
that bears a repunched letter on the obverse legend. You may notice other letters have been used several times on the obverse--I didn't check in detail.
On the reverse, I was really interested in the date because of some details I noticed. In particular, I see a secondary punching of the 9 and the 1. Those two were the strongest...others may be repunched as well.