Added the below images and caption to the Early 17th Century Trombone History Timeline. The instrument appears to be a trombone, although the left-hand grip of the player is unusual. Again, like many other frescoes from this region and time period, the image would seem to reflect the religious connections in trombone history.
1623—Varese, Italy: Cappella XI, cappella della Resurrezione, of Sacro Monte, is completed. The semicircular apse features a fresco by Isidoro Bianchi that includes what is probably a trombone among one group of angel-musicians (see facing detail and bottom-left of full image, below; click for larger image; public domain) (Angelis 147).