1820 B-4 (small 0). The easiest way to differentiate B-4 and B-5 is by looking at the 5 in “25 C.” The 5 appears larger on the B-4 than it does on the B-5. As for its grade, I would say F12. It is a very nice looking coin for its grade and appears to be very original.
Thank you very much, NSP. I really appreciate it! I don't actively collect CBQ's so my knowledge in this area is thin. I have learnt something today.
What’s interesting about this die marriage (and 1820 B-5) is that it was struck in 1821. The small 0 obverse die was also the first die that used the small stars on the obverse (the large 0 and medium 0 dies both used the large old style stars).