This is a plate made by Charles Field Haviland in 1868 to 1876 based on the mark on the back.
The mark under that is the monogram for the artist that bought the piece of porcelain (or set) as blank porcelain and hand painted the design that is on the plate. This is the letters TA or AT depending how you look at it. This was a common practice back then for ladies to hand paint their own porcelain to give as gifts. These days women scrapbook, back then they painted porcelain. The artist would be a descendant if it is a family piece and unknown if this piece came to you in a more random way.There were no 'famous' hand painters that used this monogram.
A hand painted CFH porcelain plate, depending on the quality of the work, has a current value of $30 to $40.00.
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