thanks - seems identical to your example 'B'. Ed. Moore seems not to have registered very much, and some added complication in view of acquiring other factories moulds - some of which were used for many decades, apparently - and according to the books their moulds ended up with Davidson early in C20.
I've no idea either why you might be associating this piece with Moore - don't seem to be many pix around for comparisons - although you may well be correct, and this could be theirs.
I still have a feeling that the design of this salt - which appears to be copying heavily faceted cut glass from late Regency - is an early pattern , although it may well have been a much later pressing.
Will probably remain one of those eternally elusive pieces.