I just added another example, below, to the collections Rear-Facing Trombones throughout History (now 71 images), Angel Trombonists throughout History (now 116 images), as well as to the Trombone History Timeline (17th century, 2nd half).

Late 17th Century—Bologna, Italy: An angel holding what is possibly a rear-facing trombone sits atop the organ case/backdrop of the older of two organs in San Petronio (see below image; special thanks to Adrian King, photographer).