Join Date: Sep 2008
Location: Bavaria, Germany - the center of 15th and 16th century gunmaking
A supplement to post # 17:
The Warsaw tiller arquebus can also be closely dated to ca. 1500; one basic fact, though by far not the only one, is that the swiveling pan cover is fixed by a screw - the earliest known use of a screw on any firearm.
As I stated here earlier, screws - though well-known - are not recorded to have come into use on items involving mechanics before the end of the 15th c., such as the Maximilian tournament breast plates (Stechzeuge) of ca. 1490 and 1495 preserved in the Vienna Armory.
Their screw heads are of early, highly figured shape.
Interestingly enough, screw heads on finely made wheellocks still retained that Gothic shape up to the mid-16th c., as can be seen on a mechanism dated 1551, also in Vienna; author's photos.