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26-Dec-2017 12:55

It is very easy to determine if the shards belong to the plateware manufactured before the 19th century.

The old porcelain pieces show crackled glaze, spots without glaze, and brown-colored edges.

Always look very closely over the entire glass bottle or other container to make sure there is not some type of logo (emblem, trademark, initials, or just a letter) that might indicate the actual glass manufacturer.

In many cases there is NO such mark, with only a number or numbers to be seen.

Many Owens-Illinois Glass Company soda bottles, for a period of time, used “G-numbers” on the bottom (numerals before or after a G), which were codes for a specific bottle shape (design), irrespective of the soda brand name or glass color.

Most bottles from the late 1940s into the 1950s and 1960s have two-digit date codes.

Illustrated among the pics on this page is the base of a bottle made at the Columbus, Ohio facility (plant #18) with a date code of “7” which in this case probably stands for 1937.



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The earliest example I have so far on the practice of dating porcelain after the. Straight sided vase. Transfer printed decoration on a crackled porcelain.… continue reading »


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