One of the most difficult denominations to get, in Uncirculated condition,
is the Halfpenny. It was a denomination that was regularly used
and thus usually comes in circulated condition.
We went through one of our vault rooms and found a box of 1953
Coronation Halfpennies in Uncirculated condition taken from the Mint Set
of that year; they came out of a plastic folder. Over the past 65 years they
have mellowed a bit, but they have never seen circulation. Years ago we
offered the 1953 Penny and that quickly sold out; we expect the same thing
to happen on the Coronation halfpenny.