One kind of items found recently in a sunken 16th century ship in Croatia are rare 400-year-old bronze trumpets of which a fragment has the inscription "LVGDVNY BATAVORVM", the Latin name for Leiden, Netherlands. They are going to try to restore the trumpet. Another article has additional information:
But the most important fact is that the ship had a valuable cargo – numerous brass trumpets, which were exceptionally rare and costly during that period. Archaeologists from the UNESCO category 2 centre in Zadar determined from the inscriptions that these trumpets originated from Strasbourg, France and Leiden, the Netherlands. Until now, no trumpets from those cities were known or have been preserved anywhere in the world.
My question is: based on other data in paintings, sculpture, books, and other historical study of the origin of our modern trumpet, what is the shape, mechanism (mouthpiece, valve, etc.), and the range of these 16h century trumpets? Is it natural or keyed? What other historical instruments are closest to these? How similar is it to the Lissandro's Italian trumpet (Genoa, 1589) whose reconstruction described in this paper, or to a "baroque trumpet" (a mid 20th century reconstruction of a natural trumpet)?