This was almost universal with many beverage bottle types (e.g., soda, beer, milk) but was variably common with just about any type bottle - especially prior to 1920.
Of course, soda & beer were reused up until quite recently.
Shape is more indicative of function - i.e., what the bottle was used for or contained - but even that has a myriad of exceptions.
See the Bottle Typing/Diagnostic Shapes page for more information on the subject..
Unfortunately, the complexities of precisely dating bottles is beyond the scope of any simple key.