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Naked examples, along with those possessing three levels, are rarer and therefore more collectible.Examples with a left-hand twist are also more highly prized but often go undetected; these marbles have a twist to their design that goes to the right of the viewer, rather than to the left as is much more common.
Hand cut agates were mostly produced in the Idar-Oberstein area of western Germany at least as early as 1775 and probably much earlier.
I have found the marble information and condensed this on one page.
Alan Basinet is the author to all the pictures and information below.
These changes sometimes left temporally sensitive indications at the level of the artifact.
The reader must appreciate that as one comes closer to the present the diversity of artifact types increases geometrically.
The purpose of this guide is to provide a general introduction to some of the historic artifacts recovered from archaeological sites in the Upper Sangamon Basin of east-central Illinois.