'A. D.'
The signature 'A. D.' is found in the form of a monogram on a quadrant dated 1553 from Naples belonging to the collection of the Museum of the History of Science in Florence. Whether this represents an owner or a maker, and with whom it should be identified, has yet to be established.

For instruments by 'A. D.', see:
   Quadrant, Signed 'A. D.', Naples, Dated 1553 (Firenze, IMSS)

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