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Keyhole effect

Achromatic 3D wireframe effect shows larger full 3D object through smaller viewing window. Complicated nonrepeating microstructure makes it strong security feature. Intended for inspection under spot light.

Keyhole effect  (from Euro hologram)

Keyhole effect  (from Expo hologram)

Keyhole effect  (from Olympus hologram)

Keyhole effect  (from Pegas hologram)

Keyhole effect  (from Lyre hologram)

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