Just went out and checked by truck. Large hole in the middle about the size of a half dollar with three small holes for attachment.
Just a note about the clock; it is on the shelf in the garage at this time. Works perfectly. It was made by the New Haven Clock and Watch Co. It is truely a large watch. It is mechanical of course, and will run 48 hours on a full winding.
When I first bought my 54, the clock was something I though I would sell off. But have come to like it as well as the visor.
Lonnie
