This music desk is from an 1845 A. Gale Square Grand, which has otherwise gone to the great concert hall in the sky. The piano was Serial #661. Unique to this desk is the fact that the top three inches are hinged to fold 45 degrees down so the piano lid can close. It measures 21 3/4 inches left to right and is 10 5/8 inches in height when unfolded. Stops for movement of the desk are built into the mounting blocks. The desk is Rosewood and the workmanship is exceptional. If you want an original piece this is it. Mounting block screw holes are 22 3/4 inches on center. Note: Disregard the’3′ width note in the listing. The 3 inches is the size of the part that folds down.