An Amazing Wine Bottle Trick
Here's a charming analysis of the relationship between the price of a wine and the depth of the punt or dimple in the bottom of wine bottles. The conclusion after the author designed a measuring device and surveyed a retailer or two:
There’s loads of scatter there. Don't worry. I did a proper statistical analysis. It’s 99.999% certain that there’s a relationship.
Bottles less than £5 have shallow dimples and bottles above £5 have deep dimples. £5 bottles are a minefield.
And here’s your handy equation
Price of bottle = (Dimple depth in mm + £3.49) / 4.3144
It's well worth reading the entire article -- the author tries to come across as quite naive -- but in fact he's done a good deal of very good research in the area of punts, [or dimples, or kickups, as you prefer].