Frame measures approximately 17 1/2 inches by 23 1/2 inches.
Vellum sheet measures approximately 13 1/2 inches by 19 1/2 inches.
Document has been sandwiched between two layers of glass.
We have not interpreted it, but it appears to be music with Latin text.
Surface wear as seen in pictures.
Document is not flat and has wrinkles appropriate for its age.
Back of frame has been taped closed.