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It is generally assumed that most early sealed wine bottles were made in England but there is little direct evidence to prove this and there had long been a thriving international market in glassware. These bottles are called "English" because they were made using coal fired furnaces first developed here but they could have been manufactured on the continent. Dutch onions are different from an English onions being much lighter both in weight and colour. Dutch bottles also have much flatter string rims.
While there is a general linear development in wine bottle shape changes presumably occurred at different times in different glass houses. Bottle shape therefore gives an age range rather than a specific date.
When dating bottles which are unsealed or undated one useful feature to consider is the string rim. More news on string rims at a later date.
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