1934A Chicago $10's had the second largest print run of all districts, 177,295,670 notes. Not something you can expect to sell for a profit, but I can't bring myself to toss them back into circulation when I find them. If I find a really beat 1934 NY (or other large print run) $100, with teller stamps, writing or tears, I'll sometimes spend those, although even then I feel a bit of guilt in doing so.
