Rams Head Antiques has dated this piece to the 18th Century.

Antoine Alexandre Joseph Cardon (1739-1822) was a Belgian portraitist and engraver. He was born in Brussels and was a student of Hyacinthe de la Peyne, painter to empress Maria Theresa, the sovereign of the Austrian Netherlands. He became a professor at the Royal Academy of Fine Arts and made his artistic career in the city. In 1822 Cardon was named a member of the Royal Institute of the Netherlands by Willam II.
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Rams Head Antiques has dated this piece to the 18th Century.
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