I was reading the 1955 BNJ article by I D Brown this morning, and all I could glean from that was that the three punches 3C, 3A, and 3B (6,7,and 8 in the article), came into service after the New Year, with 3A and 3B being discontinued before April. Of course 3B made an appearance many years later, so one can only guess that 3A was disposed of at the queen's request, or maybe the broken crown got worse? She certainly didn't like her Lis busts, hence the production of the 3-series, of which 3C was undoubtably her favourite, having such a long run, and seeing out the end of the shillings of the first period, notwithstanding the fact it was the bust of choice on the early gold coinage too. Bust 3A? I guess, if she had a favourite in bust 3C, then it probably follows that she had a least favourite, with poor old 3A the likely runt? I'll email Chris C and see what his thoughts are on it, and also take a look the early 3B coins. As you say, it could be that the 3A (and 3J) are the true rarities in the shilling series, with all the lis types being relatively searchable?