Back in the early 17th century wine bottles were small and thin walled glass making them extremely fragile, if not impossible, to ship successfully. In the 1630’s, Dutchmen, Sir Keneim Digby and James Howell teamed up and created a method of creating a thicker glass bottle using hotter furnaces. They were originally called shaft or globe bottles and evolved into onion bottles by the 1670’s.
They have a wide base, like an onion or globe and short neck with a ridge around the top, a collar, to tie the cork down. They a usually green, or brownish green, in color, due to the iron oxide in the sand used in Europe the time they were made.
The bottles were mouth blown so there will be bubbles and imperfections in the glass. These bottles were carried all over the world back then in ships and would hold wine, brandy and rum so there is no telling where they will be found. A sealed bottle, to show their owner or a family crest, are extremely rare.