Just like the George VI halves........... Take 1945 for instance. We recently bought 11 original bank rolls of 45's from an old time dealer and I found in the batch pointed fives (most) repunched 5/5 ( around 8) and 2 very scarce Blunt 5 coins. The last digit is oft times a different punch so depends on the die in use at a particular striking. Since 1921 halves are now very difficult to acquire in nice shape (mint state) it would be hard to compare various dies.