"Jacob Adam (9 October 1748 – 16 September 1811) was an Austrian copper etcher.
Adam worked mainly for printing offices, but is best known for his small ...
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format portraits of which he created more than 100. He was born and died in Vienna.
Adam created miniature portrait etchings of famous people of his day, including Charles-Joseph, 7th Prince of Ligne and the Holy Roman Emperor Joseph II; the latter etching is kept in the collections of the Metropolitan Museum of Art in New York." - (en.wikipedia.org 05.10.2022)