Greenwood Pottery Company, Trenton, NJ c. 1904.
Sterling China, Wellsville, OH, 1950's. 
Shenango Pottery, New Castle, Pennsylvania 1940-1950, "Inca Horizon" pattern #SGO-039.
Syracuse China Co, Syracuse, NY, 1900-1966, "Columbine" Union Pacific Railroad China.  I no longer own this piece, but had to put it on for at least bragging rights.  I bought it in an antique shop in Sciota, PA.  The woman who owned the place was selling off her pat collection.  I purchased a few from $10-$35.  Then she said, and I quote "Anything in this shoe box is $5 a piece."  And yes, you guessed it, I bought it for $5.  Anyway, I sold it on Ebay for $463.00 a year later.  (I've seen it go for as high as $850)  I never told the woman, just kept it my own little secrect.  It's one of the most sought after Railroad Patterns, but it's just wasn't the style that I collect.  So I let someone else enjoy it.
6/16/05- Onondaga Pottery Co, Syracuse, NY, impressed diamond with 30 indicating it was made in 1914.
Bauscher Brothers, Bavaria, Germany, 1921-1939.
Scammell China Company, Trenton, New Jersey, 1920-1930's, "Indian Tree".
Onondaga Pottery, New Castle, Pennsylvania, 1927, "Centennial" pattern.  Baltimore & Ohio Railroad. 
Looking for info.  Embossed circle with X, illegible embossed mark as well.  Pre 1891.
McNicol, East Liverpool, OH, "MCN6" pattern.
Syracuse China, Syracuse, NY, 1920, "Glendale",  SYR-028.
Shenango, New Castle, PA, 1940-50, "Green Lines".
Buffalo China, Buffalo, NY, 1960's, "Spraymist Green", BUF-020.
Syracuse China, Syracuse, NY,  Econo Rim.
Emipre Crafts, Wayne County, New York, 1956-1963.
Greenwood Potteries, Trenton, NJ, c. 1904
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