How can I tell how old my liquor bottle is?

Identify the Type of MarkingsEmbossed labels or product names often appear on the sides of bottles. Makers marks often appear on the bottom of the bottle. Pontil marks are circular shapes on the bottom of the bottle that indicate that the bottle is made of free-blown glass.More items

When did bottles start having screw tops?

Invented in the early 19th century, screw tops werent produced with any uniform standards. As a result, they werent widely used until machine-produced bottles became commonplace in the 1900s.