Where do you live Operaguy & David? I have seen lots of Coronation decanters - I could have 5 by now instead of just two. I have sets of Goblets, White wines , Large Tumblers & Small Tumblers, as well as two jugs, plus sundry bits with the black base.
It is noticeable to me that all the items I have have been here in Australia and I can't remember ever seeing the pattern for sale in the UK. This makes we wonder if in fact the original design was intended for Edward the 8th's coronation - and the factory decided to get rid of its useless(as there was to be no coronation) to the colonies - as far away from the UK as possible.
Just a recent wrinkle. In conversation with a dealer hoping to get more black Coronation items(he only had Amber) he mentioned that in the distant past he was fairly certain he had seen a red version as well. Something for me to search for.
PS. Those Goblets are excellent for champagne - 4 glasses to a bottle but they are wonderful in the hand.