Hello Chris... don't see any etching - just big and small wheel decoration.
You don't mention whether either piece shows any matching Nos. - my own thoughts are that the heavily cut stopper doesn't match the decoration on the body, and the fit on matching items is good, usually, rather than 'not bad'. Sometimes it's possible to improve a slightly poor fit by using valve grinding paste, but the process does create a matt interior to the neck, and mostly not worth the time spent.
When matching Nos. are visible, the type of script can sometimes help to determine if Continental, or other - but it's not an infallible yardstick.
Don't think the floral decoration helps really - I thought at first bulrushes, but suspect they are just a stylized something.
Possibly not British - and middle third of C20 although could be a little earlier but the amount of wear doesn't appear to suggest C19 age - regret no answer to the blue colour.
Attractive piece, but regret so many of these decanters lack specific features which would otherwise aid provenance and they were made in their zillions.
sorry this is really of no help.
I'd suggest this was a decanter rather than carafe - mainly because of the narrow neck opening, but that is just my opinion.
Let's hope others might have a better idea of its pedigree