Sail well used by my late father. Appears to be in good shape though! No tears or holes. There are a few spots on it, and pale tan stains. See photos.
I do not know what MATERIAL the sail is. This tool makes you pick so I chose nylon but that may not be right.
Measurements are 12' along what I believe is the bottom edge; 24' on what I believe is the side that attaches to the wire; and 20' on the open triangular edge. I could be wrong as to which side is which!