Hi - lovely decanter - pity it's not mine:-) Sorry, going to be picky now .......... going back some way when I had Hajdamach's book on C19 glass, we spoke of the Various Thomas Webb glass patterns in said book - one of which was 'moire' - at least I thought it was from T.W. - perhaps it wasn't T.W. I forget the dates it was used, but presumably - like many of the T.W. patterns - it started life in the latter part of the C19, and from what I remember it was a geometric construction of overlapping curved lines - producing what might be described as a slight shimmer effect - whether it was a genuine lift from the Persian/Iznik period I don't now remember. Memory seems to be useless now - I don't even remember if T.W. Registered the design. I'm slightly confused now ......................... when you say 'the pattern is called moire', are you referring to the engraving - the shape of the bottle, or something else. I've only ever known moire as the T.W. decorative feature of overlapping lines - an effect that is suggestive of Persian/Iznik.
P.S. 'moire' was definitely a T.W. decorative pattern.