Guilloche - This is the technical name for a geometric design found on many banknotes. Generally thes guilloches are used not only to make the note look pretty but to make it tough to copy, thus they are a security device.
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guilloche: Embellishment found on some banknotes - a motif of intricate interweaving lines, created by a mechanical engraving machine, like an elaborate spirograph.
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Samaria AR Obol. ca 375-333 BCE. Facing head of horned mythical beast within guilloche border / D, winged mythical beast reclining right within guilloche border; all in incuse square.
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Head of eagle; symbols, palmette and guilloche pattern. Incuse square
AR Stater
Pu · nu · (Πνυ ·) or no inscr. Bull stand- ing.
 See also: Inscription, Reverse, Eagle, Coinage, Silver
  
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