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Step 1
Look at the lip or opening of the bottle. Antique bottles had their openings done by hand, so it should not look perfect. It should look flawed and misshapen.
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Step 2
Turn the bottle over and examine the base. Antique bottles should have a mark where the rod that was used to heat and form the bottle was broken off.
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Step 3
Note the color. The darker the brown of the bottle, the likelier it is antique. Dark bottles were commonly used before refrigeration to keep the contents inside from spoiling. A dark brown bottle denotes that it was made for that purpose.
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Step 4
Look at the bottle's stopper, if it has one. If it has a screw top, you can be certain that it doesn't date back any later than 1920.
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Step 5
Look for glass that appears to be hand blown---that is, uneven and imperfect. This denotes that the bottle was not mass-produced, and is probably an antique.
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Step 6
When in doubt, contact an antiques appraiser for his or her thoughts on the item.





















