The membership of this monetary union and its predecessor
agencies has fluctuated somewhat over the years, and most of
the constituents have issued their own commemoratives.  In
the old colonial "British Caribbean Territories" series the
1958 ½¢ used to be a highly promoted "rare" coin, with
dealers pushing them at $100.00.  Then, so goes the tale, a
bag of them was found at the bank in use as a doorstop.  The
price dropped and now they're just as common as the '55s.
There are no rare dates in the BCT series, but it is
difficult to complete a date set in uncirculated.  Most 1¢
and 2¢ can be found so, but the others are tough.
Exceptions might be the 1965 5¢ and 1955 50¢, of which I've
seen small lots of each, but just try to find a 1960 5¢ in
unc.  Go ahead, I dare you.
There are also three proof set dates, two of them
findable, and an assortment of single date proofs, which
generally are not.
Under the rubric "East Caribbean Territories" SCWC lists
two $10 coins, which both carry that designation, and the 8
piece proof set of 1970 $4 coins, which do not.  The ECT
coins in both copper-nickel are not rare, but once again
people need them for their type sets or their
one-of-every-country collection, so they don't stay in
inventory.  The $4 proofs are not rare either, but they
usually come broken out of the case, so I'll call the set
The latest designation, "East Caribbean States," gives a
nod to the expressed independence of these now free nations.
A minor currency was introduced after a 15 year lapse.  1981
dated aluminum coins were imported in bulk, and I believe
large stocks are still available.  Not so the copper-nickel
minors and goldine dollar.  The 10¢ and 25¢ turn up on
occasion in poundage, but cannot be obtained in major
wholesale quantities.  Other dates tend to be harder to come
by.  Commemorative coins of the 80s in copper-nickel, silver
and gold, and proof sets, are a bit difficult because of the
same collector demand patterns noted above.