Pete, I've tweaked your subject line to make it more relevant... having a proper descriptive subject line helps catch people's attention and helps with search results. :thup:
I think your jug is most probably of Polish or Czechoslovakian origin, we see a lot of these in various decorations where I live, plus plain coloured ones - I have 2 plain ones and they are nicely made with a polished pontil mark on the base. Someone else can probably add more for you.