This is a vintage Coach Shoulder Sac, style 9730 from the 1980s. Brown leather with brass hardware and zipper. Made in New York City. Serial number 212-5805. It is in very good condition, showing extremely light wear on the edges.
Top to bottom - 9.5 inches
Width - 13 inches
Depth front to back - 4 inches
Strap total length - 45 inches end to end