A clear glass unrimmed face disc which may be convex or flat and which may or may not have a beveled edge: it has a wide metal shank-plate fastened to the front disc, with black adhesive material: a pattern (sometimes hit or miss) which must be inserted between the glass disc and the shank plate, never on the observe side of the disc.
These are very fragile buttons..believed to be dated between 1840-1870.
The largest button someone has repaired with a self shank. The transparent blue glass with pearl chips is constructed the same as the others. Click on picture to enlarge.
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