Millions of pieces copying earlier originals have been produced over that last fifty or so years.They have attained sufficient age to begin to blend in with the authentic originals and have even become collectible in their own right.
-The glass is clear (colorless) with just the slightest "straw" tint when looking through the thick portion of the base.It has many links that deal with the different ways bottles are dated (color, columns, etc.). Artifacts from Phillipsburg, Norfolk Island: Examples Chinese export porcelain, English wares, terra cotta; wine and spirit, gin, medicine bottles; decanters & window glass Bank/6559/scc125University of South Alabama Archaeology Website: Artifacts of Colonial Mobile: French faience and coarse earthen wares, Spanish colonial majolicas and coarse earthen wares, some Dutch and English delfts, and English colonial coarse earthen wares. Archaeology at the Florida Museum of Natural History: helps identify historic period ceramics and sherds and learn about specific historic-period ceramic types.Antique Bottles of Baltimore: collection contains bottles from the 1790s onward.There are pictures of each of the bottles and detailed descriptions with some analysis. Aussie Bottle Digger: This site contains information about antique bottles in Australia. Artifacts from Phillipsburg, Norfolk Island: Examples Chinese export porcelain, English wares, terra cotta; wine and spirit, gin, medicine bottles; decanters & window glass Bank/6559/scc125Smithsonian Institution Website -- Ceramics: 18th c.Most reproduction glass was not made to cheat glass collectors. It copies old glass when those shapes and patterns are attractive to modern buyers.It utilizes old molds because they are much less expensive than new ones.All bottles made before the turn of the century are partly or completely hand blown and formed.Bottles made after about 1914 were produced in much greater number by machine (ABM for Automatic Bottle Machine).It is mass produced using modern machinery and methods.In these distinctions lie valuable clues to estimating age.