Another way to tell older Turlington bottles from their slighty newer counter parts are the round contours in the shoulders of the bottles.
The next generation still sporting the flared lip had squared shoulders in comparison.These evolved into the next generation of rounded lips.
There is also an earlier type that is rectangular used before the 1754 type. I have seen pictures of a couple of them on the British forum. And quite a few later English flint glass ones. That date 1760s-1800. I saw one that was about twice the size of a normal Turlingtons with a 1770s patent date in flint glass few years ago at a show in Pa. Heres an early Flint glass example thta I dug in Philadelphia from a late 18th century privy.
I bought this jar to store my pottery pieces from Georgia in, but before I fill it up, I'd like to know how old it is. Dating a ball jar is super easy. All I need is one of them guides and that's it....