One reason is the sediment collection. This type of bottle was invented in the fourth century and now it is common for bottle of wine, champagne and sparkling. Some wines, if not properly filtered will still have some sediment in them. This is true of older wines that have been aged for many years. The sediment will form a thick ring around the bottom of the dent and not be easily removed by pouring the wine.
Maybe this bottle was originally created for champagne because the shape and the thickness of the punt is also used to increase the strength of the wine bottle which will allow the bottle to hold beverages that are under pressure like sparkling wine.
Another reason is that this shape provides a nice place for the person pouring the wine to place their thumb which aids in pouring the wine.
There is also a legend that says that in ancient times the servants in the houses of the nobles would know party guests better than their masters would. To show whether a guest was reliable or not a servant would put a “thumbs up” inside of the punt while pouring the wine.
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