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The base of a piece of pottery also reveals the type of clay.
Even if there is no mark identifying this, the color or texture of the unfinished base can reveal the type of clay that was used.
The Grueby vessels form (size and shape) is attributed to George Prentiss Kendrick with the artist mark for Julia Bradley.
The production of contemporary art pottery by Van Briggle as well as the fact that the company did not maintain great consistency in its bottom markings can make it difficult for novice Van Briggle collectors to determine accurate dates of production.
Shortly, visual recognition programs may start to make it much easier for anyone to identify a piece.
A vast computer library of known pottery examples is being compiled as of this writing – soon all you have to do is input a picture of a new piece, and the program will compare the image data to all known examples.
With a basic knowledge of clay color and texture and bottom markings, approximate dating of Van Briggle Pottery can easily be determined.
Since the majority of collectors are interested in dating early examples of Van Briggle this discussion will focus on dating examples from the 1920s and earlier.