These are usually called flip glasses after the mulled drink they were used for. This one is beautifully wheel engraved with a fox, a bird on a tree stump, foliage and ferns which have been intaglio cut. The rim is fire polished and it has a large ground pontil with the remains of a small part of the pontil mark in the centre and lots of wear. I think it's probably German or Bohemian and I'll risk saying it's early 19thC. although it could be earlier or later, it's difficult to date.