The appropriate jewel of a Mark Master. They are made of gold, silver, or copper and must depict the form of a keystone. On the obverse or front surface, the device or "mark" selected by the owner must be engraved within a circle composed of the following letters: H.T.W.S.S.T.K.S. On the reverse, the name of the owner, the name of his Chapter, and the date of his advancement, may be inscribed.

See also: Penny

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