Beautiful jug and what I love the most is the colour along with the wider rim and more plentiful shape. It is delightful and the colour which I have described as a blue green could perhaps also be called teal.
This is a vintage jug and reminds me of denby pottery from the 70's and 80's. While this is not Denby it has a similar feel and this is why I have dated it of that period. However if could well be a little earlier and more mid-century.
Either way a stunning piece with beautiful colour.