C. Bonner, Amulets Chiefly in the British Museum, Hesperia 20, 1951, 301-345, no. 64.

Obv. A copy of Chiflet's engraving of the Vienna chalcedony, with many additional blunders. The forger has reduced the inscription to ten lines, has omitted the last two words, φυλάξετε Μαιανῷ, and has not kept the lines as in the original, except the first, where he omitted a syllable.
Rev. Copied from Chiflet with even worse mistakes than those of the obverse. See the comment above (p. 307). It is particularly noteworthy that on both obverse and reverse the inscriptions were cut retrograde, to be read from an impression, contrary to the usual style of magical gems.
Sard. Broad oval, ca. 23 x 18. Obverse slightly convex. The illustrations are from impressions.