Bottle Attributes Plate Mold Shapes

The shape of the plate that was used to apply lettering to a bottle may or may not provide information on how to narrow the date on beer bottles.

Below are the different shapes of lettering that are found on glass bottles

Cartouche Plate Cartouche Shaped Plate, Soda circ: 1855-1865
This plate shape was rarely used and appears on bottles in the upper Midwest only.  Most of the bottles that used this plate shape are from George Lomax of Chicago, Illinois, but there are at least two other firms that used this plate style.

There are two other bottles, one form New Orleans, Louisiana and a second from Saint Louis, Missouri that had a cartouche shaped design surrounding their embossing, but these are not plates and were cut into the mold itself.
Diamond Plate Diamond Shaped Plate, Soda circ: 1890-1900, Beer circ: 1885-1895
This plate shape was rarely used on Hutchinson bottles and has only one use on a champagne beer bottle.  Several of the bottlers using bottles with this plate are clustered around or from Corning, New York.
Ellipse Plate Ellipse Plate Ellipse Shaped Plate, Beer circ: 1846-1850 and 1895-1918
This plate shape was only used on beer bottles.  There are two distinct periods when this shaped plate was used.
The first date to the period 1846 to 1850 and were used on bottles produced by a Philadelphia area manufacturer and the bottles using this plate were from firms located in Eastern Pennsylvania and one from Camden, New Jersey.  The plate is on the lower portion of the bottle.
The second were used mainly on export beer bottles having fluted bases and are made mainly with flint glass.  These bottles were used to bottle lager beer in an export style and were used by bottlers that follow the Appalachian mountains.  These plates are generally located closer to the shoulder of the bottle.
Horseshoe Plate Horseshoe Plate Horseshoe Shaped Plate, Soda circ: 1880-1915, Beer circ: 1875-1900
This plate shape was used extensively on soda, especially on Hutchinson, bottles and on beer bottles to a much lesser extent.  The use on soda bottles also occurs on pony shaped bottles and this plate shape was used mainly on East Coast bottles.  Many of the Western bottles using this plate shape were manufactured by East Coast glass works.
On beer bottles, plates with this shape were used on some early porter bottles from the 1875-1885 period and later Weiss and lager beer bottles.  Some of the beer bottles have plates that fit into the front leaf and extend from the shoulder to the base.  The use on beer bottles was less than six percent of that used on soda bottles.
Leaf Plate Leaf Plate, Soda circ: 1890-1920+, Beer circ: 1875-1920+
This plate shape makes up one of the parts of four part molded bottles and was used almost exclusively by glass works on the West Coast, Canada, and England.
One beer bottles, there is one early mold that was used by Cunningham & Ihmsen before they went out of business in 1878.  Their usage on beer bottles picked up during the 1890s.
Oval Plate Oval Shaped Plate, Soda circ: 1880-1920+, Beer circ: 1878-1920+
The oval shaped plate was used extensively on soda and beer bottles and was used extensively on East Cost bottles. 
Rectangle Plate  Rectangular Shaped Plate, Soda circ: 1848-1900, Beer circ: 1848-1910
The Rectangular shaped plate was the most popular shape of plate used during the period 1850-1880, but continued to be used occasionally in molds until about 1910.  This form was first used about 1848 by the Union Glass Works of Philadelphia and was quickly adopted by other manufacturers.  This plate style was replaced by the oval and round plates during the 1870s.  Some times the plate fits into the front leaf of the mold and at other times, it becomes part of the front leaf.  These can be identified as the top and bottom lines of the plate extend from seam to seam.
Double Rectangle Plate  Double Rectangular Shaped Plates, Beer circ: 1848-1852
The double rectangular plate had two plates that inserted into the front leaf of the mold.  It was initially introduced about 1848 with the idea that the bottom plate could be used for the city name and would not require the expense of engraving the city for a new customer.  This style of plating was used on both a porter shaped bottle mold and an early ale shaped bottle.  The majority of these bottles are from Philadelphia and were made by an area glass manufacturer.  As such, these molds have bottom plates engraved "Philada" or blank plates.  There are no known plates with other town names, even though there is at least one bottles using this mold from a town outside of Philadelphia.  This bottle and those with no embossing bear blank plates.
Rectangle Front Plate Rectangle Back Plate Rectangular Shaped Front & Back Plates, Soda circ: 1852-1857, Beer circ: 1852-1857
This approach of having a plates on the front and back of the bottle was along the same lines as the replaceable city plate of the double rectangular form.  In this case the back plate was used for a product, a plate for the manufacturer, or some other decoration.  "Brown Stout" in an arch was the most common embossing of the reverse plate.
Union Glass Works, of Philadelphia, was the manufacture of these bottles, which exist in the porter, soda, and pony shaped bottles.  Union Glass Works is embossed on the reverse side plate of several soda water bottles and around the base of one of the pony bottles.
The use of this mold ceased with the closure of this factory in 1857.
Round Plate Round Plate Round Shaped Plate, Soda circ: 1852-1857 and 1870-1920+, Beer circ: 1877-1920+
The round shaped plate was used extensively on soda and beer bottles and was dominant in all markets.
An early iteration was used on soda bottles in New Orleans, Louisiana and would have been of Pittsburgh or a glass works of Midwestern origin.  These bottles date to the early 1850s.  The form was generally abandoned until used by the Hamilton glass works in Ontario, Canada about 1870.
Their use on beer bottles, started about 1877 on the early generation of bottles to be used in bottling lager beer and some porter bottles.
This is by far the most common type of plate mold shape.
Oval Plate Oval Plate Round And Ellipse Shaped Plates, Beer circ: 1900-1910
This style of plates, with a round plate n the front and a ellipse shaped plate on the reverse was only used by one Lancaster, Pennsylvania bottler on two differently embossed export beer bottles. The idea was that the name and city could be embossed in the round plate on the front and the monogram of the firm on the reverse.
Semicircle Plate  Semicircle Shaped Plates, Beer circ: 1855-1865
The Semicircle plate was used exclusively on three mold porter bottles of Ohio Valley manufacture.  The plate is on the shoulder of these bottles.  At least two bottles are marked " A. ARBOGAST" and "PITTS" on the base.  This is also been called the half-moon plate.