Antique bottle - deep green glass Bitters bottle? 25cms tall

A tall 25cms bottle in deep green.   In good used antique condition.  There is an embossed mark under the base which looks like a large “K”.  No chips or cracks noted.  A couple of nice bubbles in the blass.   Looks as if the bottle was made in a mold and the top put on after.  Please look at the pictures carefully and dont hesitate to ask any questions.