Featured Cut glass decanter

Whiskey decanters tend to be square in shape. Some decanters for Brandy, can have a similar shape as Your example, however the metal mount with its pouring spout suggests it was produced for Red wine. The aptly named "Ship Decanter" is/were produced with large/flat bottoms to them which prevents them toppling over whilst at sea in a gale force 9 hurricane! As with like drinking glasses their shapes & sizes can improve the drink within, and to "decant" red wine (and/or Port) from its bottle and into a Decanter, allows air to distribute throughout the liquid which improves the taste & aroma... unless of course you're a Redneck, in which case you simply pop the cork and swig from the bottle or use the wine to feed the kids with, like I do!

 

This is a very typical, possibly German, Claret Jug. Claret was very fashionable between the 1880's and the pre WW1 era. The claret jug has lived on since, often used as a trophy for various, often sporting events. They can be extremely fancy or be quite plain like the Christopher Dresser examples.

I've sold quite a few over the years and still have one - this English one.

 

Very nice @blooey