Having done much research on these extraordinary items and not seeing any thing quite like them, I am saying that they are 19th century mezzotints similar to the paintings done by Michelangelo on the Sistine Chapel with all wood (no gesso) 16th century Florentine style frames. I have not removed the Engravings from the frames. I see no marks to describe manufacturer/artist. they are in excellent condition as are the frames measuring 16 1/2" x 3/4". The Renaissance architects incorporated 'Tondos' in the designs of arches.
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Antiques, Decorative Arts , Fine Art, Linens.
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