It looks early, 16th century I'm not sure of. It appears to be blown in the "German Half Post" style thus, perhaps, the "German" attribution. The ground stopper is throwing me though.
16th century would be very early. I think most of them were late 1700's through the early 1800's. One of mine has the sides polished down to fit into a case that would have held several bottles. There was a very nice cased set on the forum about a year ago. I believe some of these were made here in America but most in Europe.
If it has what I think it has,at least what I think I see around the top gold gilded decoration fire glazed into the finish then the bottle is Bohemian nowadays Czechoslovakia from the 1770 to 1800 time period. A lot of these made it over to the United States via England as part of traveling personal liquor chests of prominent people. From my own collection I have shown this one before at the forum before........ been awhile. This one is from Essex street Salem Massachusetts. This was the property of George Corwin and he chose a slightly older similar form of case bottle more crude with copper wheel decoration. These bottles are German in form and decor. They either came from Germany, or they were made locally just a few miles away at Germantown Massachusetts at the Braintree glass works. Either way the bottles in this case although similar to yours were not as refined as the Bohemian glass at the same time.