Some Quick Things To Look At To Date Bottles


Side Seams:

None: bottle may be free blown and uneven shape dating before 1860 or the bottle may have an even shape but spun in the mold to smoth out the seams- a common practice around 1900-1920.

BIM: side seams run from base and end below the top of lip. This is a result of Bowing In Mold (BIM). The lip is usually applied by hand later.

3PM: (3 piece mold) Bottom half (from base to shoulder) has no seams then there are seams near the shoulder that runs completely around the bottle. Two side seams run up the neck and end below the top of the lip. This was used from 1840-70. The lip was also applied by hand later.

ABM: if the side seams run through the top of the lip then it made this way. AMB stands for Automatic Bottle Machine. This type of bottle making started appearing in 1905 and by 1920 most bottles were made like this.

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